Question

Standing at the edge of a cliff 240 m tall, you throw two balls into the air – one directly upwards at 5 m/s and another directly downwards at -5 m/s. Use conservation of energy to show that they will have the same final speed at the bottom.

Answer 1

Since Both Are thrown from Same Height their P.E = mgh will convert to K.E......therefor they have same velcity

Mgh = mv^2/2

Answer 2

So you take 240*5^2/2 and 240 *-5^2/2?