1.

motorcar of mass 1200 kg is moving along a straight linvith a uniform velocity of 90 km/h. Its velocity is slowed downo 18 km/h in 4 s by an unbalanced external force. Calculatehe acceleration and change in momentum. Also cnagnitude of the force required.alculate the

Answer»

Initial velocity = 90km/h = 90×5/18 m/s = 25m/s final velocity = 18 km/h = 18× 5/18 m/s = 5 m/sacceleration = (final velocity -initial velocity )/ time taken =( 25 - 5)/4 = 5 m/s²now, change in momentum = m( final velocity - initial velocity ) =1200×( 25 - 5) = 24000 Kgm/s

force = change in momentum / time = 24000/4 = 6000 N



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