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Q.

A space craft is moving vertically upwards. An object is dropped from it at an instant where its velocity is4.9 ms−1  QUOTE  . If the object reaches the earth after 2 s then the final velocity of the object is (g=9.8 ms−2)

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a

9.8 ms−1

b

14.7 ms−1

c

4.9 ms−1

d

0 ms−1

answer is C.

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Detailed Solution

Initial velocity u=−4.9m/s  (Negative sign indicates that initially body moving upward)

Time t = 2s, Acceleration a  = g = 9.8

v=u+at=−4.9+9.8(2)⇒ v=14.7ms−1

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