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

asked Jul 16, 2023 204k views

24 votes

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

3.9k points

Please log in or register to add a comment.

2 votes

Step-by-step explanation:

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

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

(81 * 2)/(81) = m

m = 2kg

Sajad Mirzaei answered Jul 22, 2023

4.3k points

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

4.7m questions

6.2m answers