Questions 27-29 refer to a coin which is tossed straight up into the air. After

Question

Questions 27-29 refer to a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Use one of the following cholces through G) to indicate the acceleration of the coin during each of the stages of the described below. Take up to be the positive direction. Answer choice J if you thin correct. coin's motion k that none is A. The acceleration is in the negative direction and constant. B. The acceleration is in the negative direction and increasing C. The acceleration is in the negative direction and decreasing D. The acceleration is zero. E. The acceleration is in the positive direction and constant. F. The acceleration is in the positive direction and increasing. The acceleration is in the positive direction and decreasing G. The coin is moving upward after it is released. The coin is at its highest point. The coin is moving downward. 27. 28. -29. Questions 30-34 refer to collisions between a car and trucks. For each description of a collision (30-34) below, choose the one answer from the possibilities A though J that best describes the size (magnitude) of the forces between the car and the truck. A. The truck exerts a larger force on the car than the car exerts on the truck B. The car exerts a larger force on the truck than the truick exerts on the car. C. Neither exerts a force on the other, the car gets smashed simply because it is in the way of the truck D. The truck exerts a force on the car but the car doesn't exert a force on the truck The truck exerts the same amount of force on the car as the car exerts on the truck. F. Not enough information is given to pick one of the answers above. J. None of the answers above describes the situation correctly In questions 30 through 32 the truck is much heavier than the car RANS They are both moving at the same speed when they collide. Which choice describes the forces? describes the forces? The heavier truck is standing still when the car hits it. Which choice describes the forces? 30. 1. The car is moving much faster than the heavier truck when they collide. Which choice In questions 33 and 34 the truck is a small pickup and is the same weight as the car ea Both the truck and the car are moving at the same speed when they collide, which choice describes the forces? The truck is standing still when the car hits it. Which choice describes the forces? T-5

Explanation / Answer

27) The coin is moving upward after it is released

Here (G) is the correct choice

Reason :- Whenever an object is tossed upwards(opposite to direction of acceleration due to gravity(g)),then

velocity of the object decreases due to effect og "g" on the object.Hence acceleration of the object

decreases as it is moving upward after its point of release.

Here direction of acceleration is towards positive direction(since,given that to assume

upwards direction as positive)

Hence (G) is the correct choice

28) The coin is at its highest point

Here (D) is the correct choice

Reason :- Whenever an object tossed upwards reaches its highest point then its acceleration becomes zero

due to effect of acceleration due to gravity.

Hence,(D) is the correct choice

29) The coin is moving downwards

Here (A) is the correct choice

Reason :- Whenever a coin tossed upwards reaches its highest point and starts falling towards the earth then

it starts to fall towards the earth with a constant acceleration of "g" value i.e., 9.8 m/s^2.

Here constant acceleration is the negative direction(since given that to assume upwards as positive

direction then downward direction will be ngative only)

Hence (A) is the correct choice

27) - (G)

28) - (D)

29) - (A)

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