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Q.

A body is projected horizontally from certain height. After 2 s its direction of motion makes30°  to the horizontal then its initial velocity is

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a

23g

b

3g/2

c

None of these

d

2g/3

answer is B.

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Detailed Solution

tanθ=vyvx=gtu

tan30=10×2u13=20u

u=203u=23gms1

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