1. Ball A is dropped from rest from a window. At the same instant, ball B is thr
ID: 1688340 • Letter: 1
Question
1. Ball A is dropped from rest from a window. At the same instant, ball B is thrown downward; and ball C is thrown upward from the same window. Which statement concerning the balls after their release is necessarily true if air resistance is neglected?(a) At some instant after it is thrown, the acceleration of ball C is zero.
(b) All three balls strike the ground at the same time.
(c) All three balls have the same velocity at any instant.
(d) All three balls have the same acceleration at any instant.
(e) All three balls reach the ground with the same velocity.
2. A tennis ball is shot vertically upward in an evacuated chamber inside a tower with an initial speed of 20.0 m/s at time t = 0 s. How high does the ball rise?
Explanation / Answer
When the ball having vertical motion it should have constant acceleration so all the three balls have same acceleration at any instant which is 'g' 2) The initial velocity of the ball vi = 20m/s The maximum height of the ball reached h = v^2/2g = (20m/s)^2 / 2(9.8m/s^2) = 20.4m
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