Question

A car is moving with a uniform velocity of 30 m/s.It is stopped in 2 sec by applying a force of 1500N through it brakes.
Find
1.Change in momentum of car
2.Retardation
3. mass of the car​

Answer 1

Answer:

u=30m/s

t=2s

v=0m/s

F=1500N

2) $a=\frac{v-u}{t}=\frac{0-30}{2}=-15m/s^{2}$

3) F=ma=-1500N

-15m=-1500

m=-1500/-15

Thus, m=100kg

1) Change in momentum=mv-mu=100*0-100*30=-30000kg m/s

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