a motor car of mass 1000 kg is moving along a straight line with a uniform velocity of 90 kilometre per
hour if velocity slowdown waiting kilometre per hour in 4 seconds by an unbalanced external calculate the acceleration and change in momentum also calculate the magnitude of force required
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initial velocity = 90km/h = 90 ×5/18 m/s = 25m/s
final velocity = 18 km/h = 18× 5/18 m/s = 5 m/s
acceleration = (final velocity -initial velocity )/ time taken
=( 25 - 5)/4 = 5 m/s²
now,
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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