If a 1000 kg car is driving forward with a speed of 25 m/s and it comes to rest in a distance of 100m, the change in kinetic energy during this process is - 312.5 KJ
KE = 1 / 2 m v²
KE = Kinetic energy
m = Mass
v = Velocity
m = 1000 kg
Initially,
v = 25 m / s
KEi = 1 / 2 * 1000 * 25²
KEi = 312500 J
Finally,
v = 0, since the object comes to rest.
KEf = 1 / 2 * 1000 * 0
KEf = 0
ΔKE = KEf - KEi
ΔKE = Change in kinetic energy
ΔKE = 0 - 312500
ΔKE = - 312500
ΔKE = - 312.5 KJ
Therefore, the change in kinetic energy during this process is - 312.5 KJ
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