Question

A car of mass 2000 kg changes its speed from 72km/h to 36km/hr in in 5 seconds .find the force applied by its brake

Answer 1

Answer:

mass of car = 2000kg

Explanation:

initial velocity= 72km/hr

final velocity after applying brake =36km/hr

time taken to apply break = 5 sec 5/60= 1 / 12 hr

so acceleration= initial velocity - final velocity / 1/12

36-72×12/1

-36×12 = -432

A/Q

force = m×a

2000×(-432)

-864000

Answer 2

using the formulas

$v = u + at$

and

$f = ma$

answer got is....

F = 51,840,000 KM/H

or 14,400,000M/S

HOPE ITS THE RIGHTANSWER