Question

calculate the work done by the brake of a bus of mass 15000 kg when it's speed is reduced from 40m/s to 10 m/s​

Answer 1

Explanation:

from condition:

bus is decelarating.

u= 40m/s

v=10m/s

by v=u+at

t=1sec

a=-30m/sec^2

then using EOM

s= ut+1/2at^2

s=25 m

w= 15000 * 25 Kg -m