Question

(b) A car of mass 2000kg is decelerated uniformly from a velocity of 10ms-1
to 5ms-1 in 5s by applying brakes. Calculate the initial and final momentum of the car.
Also, find the magnitude of the retarding force exerted by breaks on car.
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Answer 1

Answer:

initial momentum = 20,000

final momentum = 10,000

a = -1m/s²

Step-by-step explanation:

Here, give:- m= 2000kg

u= 10m/s

v=5m/s

t= 5s

now

initial momentum = mu

2,000×10

20,000

final momentum = mv

2,000 × 5

10,000

Now

a= (v-u)/t

a = 5-10/t

a = -5/5

a = -1m/s²