Question

4) A scooter is moving with a velocity of 20m/s when brakes are applied. The mass of the

scooter and the rider is 180Kg. The constant force applied by the brakes is 500N.

a) How long should the brakes be applied to make the scooter come to a halt?

b) How far does the scooter travel before it comes to rest? ​

Answer 1

Explanation:

u (initial velocity) = 20 m/s

v (final velocity) = 0 m/s (as the vehical comes to rest)

m (mass) = 180 kg

force = -500 N ( as it comes to rest)

f = m(v-u)/t

so,

-500=180(0-20)/t

-500t=-360

t=360/500

t=0.72 s

b)s = ?

2as = v2-u2 (3rd equation of motion)

2x (v-u)/t x s= 0- 20x 20

2 x -27.7 x s = -400

s=400/55.4

s=7.22 m