a motor car of mass 1200 kg is moving along a straight line with a uniform velocity of 90 km per hour its velocity is slow down to 18 km per hour in 4 seconds by an unbalanced external force. Calculate the acceleration and change in momentum, calculate the magnitude of the force required.
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u=90km/h =25m/s
V=18km/h=5m/s
as v-u÷t =a
= -5m/s^-2
change I momentum
mu -mv= 1200×5 -1200×25=-24000kg/m/s
force=ma
1200×-5= -6000(negative sign represents regarding force)
V=18km/h=5m/s
as v-u÷t =a
= -5m/s^-2
change I momentum
mu -mv= 1200×5 -1200×25=-24000kg/m/s
force=ma
1200×-5= -6000(negative sign represents regarding force)
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