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Q.

A stone is projected horizontally with a speed of 40 m/s from the top of a tower of height 45 m. Then speed of the stone just before it strikes the ground is

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a

20 m/s

b

30 m/s

c

50 m/s

d

60 m/s

answer is C.

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Detailed Solution

V = Vertical component of velocity =2gh=2×10×45 m/s=30​ m/su = horizontal component of velocity = 40 m/s∴ speed=u2+v2=402+302 m/s=50 m/s
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