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Q.

A body is projected with velocity 24 ms−1 making an angle 30° with the horizontal. The vertical component of its velocity after 2s is (g=10 ms−1)

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a

8 ms−1 down ward

b

32 ms−1 upward

c

32 ms−1 down ward

d

8 ms−1 upward

answer is B.

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Detailed Solution

u=24ms−1  θ=30°

Aftert=2s  

Vertical component of velocity

V=usinθ−g(2)=2usin30°−2g

=24×12−10×2

=12−20

=−8ms−1 =8 ms−1 downwards 

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