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Laws of Motion — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsLaws of Motion1 Mark
Question
A mass m moving with a velocity u hits a surface at an angle $\theta$ with the normal at the point of hitting. How much force does it exerts, if no energy is lost?
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Answer

Force = Rate of change in momentum $=\frac{2\text{mu}\cos\theta}{\text{time}}$ $\because\ \text{mu}\cos\theta$ is momentum along the normal at the point of incidence.

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