Question

A 100kg is rolling down a hill with 129000J of energy, how fast is it going

Answer 1

In order to calculate the speed of an object, we need to use the formula:

Speed = (2 x Energy) / Mass

So, using the information given in the question:

Speed = (2 x 129000 J) / 100 kg

To find the speed, we need to divide the energy by the mass and then multiply by 2.

Speed = 2580 m/s

So, the 100kg object is rolling down the hill at a speed of 2580 m/s (or approximately 5800 mph)