Question

a car of mass 2000kg changes its speed from 72 km/h to 36km/h in 5 seconds the force applied by the breaks is

Answer 1

Answer:

Explanation:

mass of the car=2000

u=72km/h=20 m/s

v=36km/h=10 m/s

linear momentum =mv-mu=20000-40000=-20000 N but -ve symbol represents braking so 20000 N is the force applied by the brake.

Answer 2

Force can be defined as the rate of change of linear momentum of a car.

Explanation:

• Hence the formula for the force acting on the car is equal to, m(v-u)/t

• Here v = 72 kilometre per hour or 20 metre per second,
• U= 36km/hr or 10m/ sec, t= 5 sec.

• The mass of the car is equal to 2000 kg

• hence by putting the above values in the formula given above the value of force is equal to, 2000x (20-10)/5 = 4000N

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