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PHYSICS 6A PRACTICE QUIZ 2 THE FOLLOWINGMULTIPLE CHOICE QUESTIONS ARE NOT TO BE TURNED IN FOR GRADING. THEY ARE INTENDED AS A SELF EVALUATION QUIZ AND PRACTICE FOR THE MIDTERM EXAM MULTIPLE CHOICE. Choose the ONE alternative that BEST completes the statement or answers the question. 1) A car moving at a velocity of 20 m/s is behind a truck moving at a constant velocity of 18 m/s. When the car is 50 m behind the front of the truck, the car accelerates uniformly at 1.8 m/s 2 . The car continues at the same acceleration until it reaches a velocity of 25 m/s, which is the legal speed limit. The car then continues at a constant velocity of 25 m/s, until it passes the front of the truck. The distance the car travels while accelerating, in meters, is closest to: A) 50 B) 54 C) 58 D) 62 E) 66 2) A test rocket is ﬁred straight up from rest with a net acceleration of 20 m/s 2 . After 4 seconds the motor turns off, but the rocket continues to coast upward. What maximum elevation does the rocket reach? A) 487 m B) 327 m C) 320 m D) 408 m E) 160 m 3) A ball is thrown straight upward with a velocity of 18 m/s. How much time passes before the ball strikes the ground? Disregard air resistance. A) 3.7 s B) 1.8 s C) 1.1 s D) 0.6 s 4) If the acceleration vector of an object is directed anti -parallel to the velocity vector, A) the object is turning. B) the object is speeding up. C) the object is slowing down. D) the object is not moving. E) this situation would not be physically possible. 5) A boy kicks a football with a certain initial velocity at an angle 20° above the horizontal. In 2.0 seconds, the ball reaches at its highest point in its trajectory. What is the initial velocity of the ball? A) 9.8 m/s B) 20 m/s C) 57 m/s D) 4.9 m/s E) 29 m/s 1

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4) If the acceleration vector of an object is directed anti-parallel to the velocity vector, A) the object is turning. B) the object is speeding up. C) the object is slowing down. D) the object is not moving. E) this situation would not be physically possible. PHYSICS 6A PRACTICE QUIZ 2 THE FOLLOWINGMULTIPLE CHOICE QUESTIONS ARE NOT TO BE TURNED IN FOR GRADING. THEY ARE INTENDED AS A SELF EVALUATION QUIZ AND PRACTICE FOR THE MIDTERM EXAM 1

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PHYSICS 6A PRACTICE QUIZ 2

THE FOLLOWINGMULTIPLE CHOICE QUESTIONS ARE NOT TO BE TURNED IN FOR GRADING. THEY AREINTENDED AS A SELF EVALUATION QUIZ AND PRACTICE FOR THE MIDTERM EXAM

MULTIPLE CHOICE. Choose the ONE alternative that BEST completes the statement or answers the question.

1) A car moving at a velocity of 20 m/s is behind a truck moving at a constant velocity of 18 m/s. When the caris 50 m behind the front of the truck, the car accelerates uniformly at 1.8 m/s2. The car continues at the sameacceleration until it reaches a velocity of 25 m/s, which is the legal speed limit. The car then continues at aconstant velocity of 25 m/s, until it passes the front of the truck. The distance the car travels whileaccelerating, in meters, is closest to:A) 50B) 54C) 58D) 62E) 66

2) A test rocket is fired straight up from rest with a net acceleration of 20 m/s2. After 4 seconds the motor turnsoff, but the rocket continues to coast upward. What maximum elevation does the rocket reach?A) 487 mB) 327 mC) 320 mD) 408 mE) 160 m

3) A ball is thrown straight upward with a velocity of 18 m/s. How much time passes before the ball strikesthe ground? Disregard air resistance.A) 3.7 sB) 1.8 sC) 1.1 sD) 0.6 s

5) A boy kicks a football with a certain initial velocity at an angle 20° above the horizontal. In 2.0 seconds, theball reaches at its highest point in its trajectory. What is the initial velocity of the ball?A) 9.8 m/sB) 20 m/sC) 57 m/sD) 4.9 m/sE) 29 m/s

6) A rescue plane spots a survivor 132 m directly below and releases an emergency kit with a parachute. If thepackage descends at a constant vertical acceleration of 6.89 m/s2 and the initial plane horizontal speed was68.9 m/s, how far away from the survivor will it hit the waves?A) 426 mB) 2.64 kmC) 301 mD) 446 m

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