Question #87092

1 Answer
Feb 1, 2018

I suspect you mean kinetic energy, not kinetic speed.
KE = 1/2 mv^2KE=12mv2

Explanation:

The equation for kinetic energy is KE = 1/2 mv^2KE=12mv2.

So, we can plug in the values given to find the KEKE.

KE = 1/2(100 kg)(12.5m/s)^2KE=12(100kg)(12.5ms)2
KE=1/2(100 kg)(156.25m^2/s^2)KE=12(100kg)(156.25m2s2)
KE = 7812.5 kgm^2/s^2KE=7812.5kgm2s2
KE = 7812.5 JKE=7812.5J

If significant figures are considered, record answer as 7810J7810J because the speed had only three significant figures