Question

A car of mass 2400 kg moving with a velocity of 20 m/s is stopped in 10 seconds on applying brakes. Calculate the retarding force

Answer 1

u=20m/s
m=2400kg
t=10s
v=0
a=v-u/t
a= 0-20/10=-2m/s^2
force =m×a
= 2400×2=4800N

Answer 2

HEYA!
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Mass = 2400kg

Initial velocity u = 20m/s

Final velocity v = 0

Time = 10 seconds .

Using the first equation of motion

V= U + AT

0 = 20 + 10 A

10 A = -20

A = -2 m/s2.


Now regarding force ,

F = ma

F= 2400× -2

= -4800N

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