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Question

A person drops from a building of height 20 m. same instant the front end of a tuck passes below the building moving with constant acceleration of 1 m/s2 and velocity of 2 m/s at that instant Length of the truck if the stone just misses to hit its rear part is : -

Options

A.6 m
B.4 m   
C.5 m
D.2 m

Solution

Time of fall of stone =
Horizontal displacement  of truck is 2 sec
                       ⇒ S = 2 × 2 + × 1 × 4
Length  of truck = 6m

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