a motor car of mass1200kg is moving along a straight line with uniform velocity of 90km per hour. it's velocity is slowed down to 18km per hour in 4seconds by an unbalanced external force. calculate the acceleration and change in momentum. also calculate the magnitude of external force acting on it.
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- the mass of motorcycle is =1200kg
- it is moving with a velocity =90km/h it velocity is slowed down to 18km/h in 4 sec so retardation force =
- f= 1200×(90-18/4)=1200×18= 21600N force
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