Question

A 2.3 kg object has 15 ) of kinetic energy. Calculate its speed.

Answer 1

Answer:

The answer is option D

Explanation:

To find the speed given the kinetic energy and mass we use the formula

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

where

m is the mass

v is the speed

From the question

KE = 15 J

m = 2.3 kg

We have

$v = \sqrt{ \frac{2 \times 15}{2.3} } = \sqrt{ \frac{30}{2.3} } \\ = 3.61157559...$

We have the final answer as

3.6 m/s

Hope this helps you