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A motor car of mass 1200 kg is moving along a straight line with a uniform velocity of 90 km/h. Its velocity is slowed down to 18 km/h in 4s by an imbalanced external force. Calculate the acceleration and change in momentum. Also calculate the magnitude of the force required.

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Mass m = 1200 kg.

(Here negative sign indicates decrease in velocity)

ii) Change in momentum = Final momentum – initial momentum
= mv – mu = m (v – u)
= 1200 (5 – 25)
= 1200 × (-20) = -24000Kgms-1

iii) Magnitude of the force required = Rate of change momentum

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