Question

A car is moving with a uniform velocity of 30.
It is stopped in 2 s by applying a force of 1500N
through its brakes. Calculate : (a) the cha
momentum of car, (b) the retardation produ,
car, and (c) the mass of the car.​

Answer 1

Answer:

(a) 0 kgm/s

(b) 15 m/s

(c) 100 kg

Explanation:

initial velocity = u = 30 m/s

final velocity = v =  0 m/s

time taken = t = 2s

force applied = F = 1500N

momentum = p = ?

retardation (acceleration) = ?

mass =  m = ?

According to the 1st equation of motion,

a = v-u/t

-30/2 = -15 m/s

According to Newton's 2nd law of motion,

F = ma

1500 = 15m

m= 100 kg

We know that

p = mv

  = 100 × 0 = 0 kgm/s

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-Aditi