Question

The kinetic energy of a javelin is 81 J, and its speed is 9.0 m/s. What is its mass?

A. 0.5 kg

В. 1.0 kg

C. 2.0 kg

D 9.0 kg

help asap

Answer 1

Step-by-step explanation:

`kinetic \: energy = (1)/(2) m {v}^(2)`

`81 = (1)/(2)m {(9)}^(2)`

`(81 * 2)/(81) = m`

`m = 2kg`