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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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60 m/s

20 m/s

40 m/s

10 m/s

answer is C.

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Detailed Solution

$\begin{array}{l} W_{F} + W_{g} + W_{N} = ΔKE \\ 40 \times 40 + 0 + 0 = \frac{1}{2} {mv}^{2} \\ \Rightarrow v = 40 m / s \end{array}$

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