Kinematics Question 209

Question: A body dropped from a height h with an initial speed zero, strikes the ground with a velocity 3km/h . Another body of same mass is dropped from the same height h with an initial speed −u′=4km/h . Find the final velocity of second body with which it strikes the ground [CBSE PMT 1996]

Options:

A) 3 km/h

B) 4 km/h

C) 5 km/h

D) 12 km/h

Show Answer

Answer:

Correct Answer: C

Solution:

For first case v2−02=2gh

therefore (3)2=2gh For second case v2=(−u)2+2gh

=42+32
∴ v= 5km/h

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