Question

A 2000kg car uses a braking force Of2000 newton to stop in 5 seconds what impulse acts on the car what is the change in momentum of the car what is the initial speed of the car

Answer 1

Explanation:

m = 2,000-kilogram

F = 12,000

t = 5 seconds

a) Impulse (I) = Ft = 12000 × 5

I = 60,000 Ns

b) from Newton's 2nd law

F = m∆v/t

Ft = m∆v

change in momentum (∆p) = 60,000kgm/s

c) ∆v = Ft/m = 60,000/2000 = 30m/s

the initial velocity is 30m/s since final velocity is zero