Question

(b) A bus of mass 10.000 kg is moving with a velocity 90 km/h. Calculate the work done to sto
this bus​

Answer 1

Answer:3125 KJ

Step-by-step explanation:

mass of bus = 10000 kg  

velocity of bus = 90 km/h = 25 m/s  

Work done = Change in kinetic energy

Final kinetic energy-Initial kinetic energy

work done=1/2* Mv^2-1/2*mu^2

when the bus comes velocity becomes zero

Thus,

v=0

Thus,

Work done=0-1/2 *mu^2=1/2*(10000)*(25^2)=31,25,000 J =3125 KJ