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  4. A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h. The force required to step the vehicle in 10 s is

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Q. A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h. The force required to step the vehicle in 10 s is

CMC MedicalCMC Medical 2011

Solution:

$ v=108\times \frac{5}{18}m\text{/}s $ $ =30\,m\text{/}s $ Momentum = 120 x 30 kg-m/s (initial) Final momentum = 0 $ \text{Force}=\frac{\text{change}\,\text{in}\,\text{momentum}}{\text{time}} $ $ =\frac{120\times 30}{20}=180\,N $