Question

Example 9.3 A motorcar is moving with a
velocity of 108 km/h and it takes 4 s to
stop after the brakes are applied.
Calculate the force exerted by the
brakes on the motorcar if its mass along
with the passengers is 1000 kg.​

Answer 1

u=108km/hr=108*5/18=30m/s

t=4sec

v=0[comes to rest]

a=?

using 1 eq of motion

 

v=u+at

0=30+4a

-30/4=a

a=-7.5m/s2

force =mass *a

=1000*(-7.5)

=-750N ANS

Answer 2

Answer:

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