Question

A 1500 kg car moving with a velocity of 56 km /h is stopped by applying brake ,find the work done by the force .​

Answer 1

Answer:

181481.48 Joules or 181.48 KJ

Explanation:

work done= change in energy

neglecting air resistance and other resistances,

work done= change in kinetic energy

= mv²/2

= (1500kg×(56km/h)²)/2

= 2352000 kgkm²/h²

= 2352000 kg× (1000m)²/(3600s)²

= 181481.48 (kgm/s²)×m

= 181481.48 N.m

= 181481.48 Joules

= 181.48 Kilo Joules