A ball has a mass of 4.0 kg and is moving with a velocity of 15.0 km/h. The ball increased its speed to 30.0 Km/h, then the K.E of the ball will ?
OK, we need to find initial KE, final KE and the ratio between them (must be > 1) We’d normally have to start by putting velocity into SI units, but as we’re only after a ratio it won’t matter.
The KE has thus gone up by a factor of
So when velocity doubles, KE goes up by the square of that (in the equation there is a