Q.

A body is projected with velocity 24ms1 making an angle 30° with the horizontal. The vertical component of its velocity after 2s is (g=10ms1)

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a

8ms1 down ward

b

32ms1 upward

c

32ms1 down ward

d

8ms1 upward

answer is B.

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Detailed Solution

u=24ms1θ=30°

Aftert=2s  

Vertical component of velocity

V=usinθg(2)=2usin30°2g

=24×1210×2

=1220

=8ms1=8ms1downwards

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