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Question

A particle is projected at an angle of 450 from 8m before the foot of a wall, just touches the top of the wall and falls on the ground on the opposite side at a distance 4m from it. The height of wall is:

A
23m
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B
43m
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C
83m
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D
34m
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Solution

The correct option is D 83m

At 45o range of projectile 8+4=R=u2gu2=12g

Height of wall=y=xtanθgx22u2cos2θ=8tan(45)g88212g(1/2)2=8823=83m


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