Question

A motorcar is moving with a velocity of 108km / h and it takes 4 s to stop after the break are applied.Calculate the force exerted by the break in the motorcar if its mass along with the passenger is 1000 kg​

Answer 1

Explanation:

u= 108 km/h = 30m/s

t= 4sec

v= 0 m/s

m= 1000kg

F=???

F= ma

F=1000a ----------------(1)

now find retardation- a

v= u - at

0=30 - a×4

4a=30

a=7.5m/s^2

now put a=7.5m/s^2 in ( i )

F= 1000×7.5

F=750 N