Question

A car travelling at a speed of 90km/h (25m/s) applies brake and comes to rest 3second if the mass of the car including passenger is 1200kg calculate the force applied on the brake​

Answer 1

Explanation:

v= u+at

at=v-u

a =v-u/ t

a=25-0/3

a=25/3

F=ma

F 1200*25/3

F=400*25 =10000 N

Answer 2

we have initial velocity 90 km/h  = 25 m/s

time = 3 second

and mass of car including passenger = 1200 kg

final velocity of a car = 0 m/s

we have to find the force

as we know f = mxa

here mass is given but acceleration is not given so we have to find acceleration.

so we have u,v and t

now we have

                    v = u+at

                    0 = 25+ax3

                     0= 25+3a

                      a = 28 m/s

so acceleration = 28m/s

now we have f= mxa

                        f = 1200x28 =33600 N

this is the right answer

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