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A body is projected vertically down from the top of a tower of hieght h ( = 40 m) with a velocity $v_{1} = 5 m / s$ . Another body is projected up from the bottom of the tower with vertically ipwards velocity $v_{2} = 15 m / s$ . When will the bodies meet ?

A

2 second

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B

4 second

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C

6 second

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D

8 second

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Solution

The correct option is A
2 second

Apply 1D motion equation for the relative motion between the bodies.

Time taken to meet will be,

t = $\frac{h}{V^{'}}$ = $\frac{40}{20}$ = 2 second

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