Question

A brick is falling downward at a speed of 25 m/s and it has 25 J of
kinetic energy. What is its mass? (Hint: You want to solve for ‘m’ in this problem
rather than KE)

Answer 1

Answer:

The answer is 1.41 kg

Explanation:

The mass of an object given it's kinetic energy can be found by using the formula

$m = \sqrt{ \frac{2KE}{v} }$

where

m is the mass

v is the velocity

From the question we have

$m = \sqrt{ \frac{2 \times 25}{25} } = \sqrt{ \frac{50}{25} } = \sqrt{2} \\ = 1.41421...$

We have the final answer as

1.41 kg

Hope this helps you