Question

9. Calculate the kinetic or potential energy in joules for each of the following situations: a. A 2.5 kg book is held 2.0 m above the ground. b Anabolieman​

Answer 1

Step-by-step explanation:

`kinetic \: energy = (1)/(2) m {v}^(2) \\ but \: {v}^(2) = {u}^(2) + 2gh \\ {v}^(2) = 0 + (2 * 10 * 2) \\ v = 6.32 \: m {s}^( - 1) \\ k.e = (1)/(2) * 2.5 * 6.32 {}^(2) \\ = 50 \: joules`

`potential \: energy = mgh \\ = 2.5 * 2 * 10 \\ = 50 \: joules`