You throw a ball straight up, it peaks out, and then comes back down to you. During this motion, the velocity and acceleration
a. always point in the same direction.
b. always point opposite to each other.
c. sometimes point in the same direction, and other times point opposite to each other.
d. depend on the way the ball is thrown.
e. depend on the mass of the ball.
c
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A 1200-kg car is being raised at a constant speed if 25 cm/s by a crane, using a 20-m long steel cable that is 1.5 cm in diameter. Young's modulus for steel is 2.0 × 1011 Pa. What is the change in length of the cable caused by the car?
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