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Q.

On a frictionless surface of variable slope a block of mass 2 kg at rest is pushed by applying a horizontal constant force of 40 N as shown. The block reaches the top and leaves the surface and falls under gravity alone. It strikes the surface some distance away with a speed of :

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a

60 m/s

b

20 m/s

c

40 m/s

d

10 m/s

answer is C.

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Detailed Solution

WF+Wg+WN=ΔKE40×40+0+0=12mv2⇒v=40m/s

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