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 B. 1.0 kg C. 2.0 kg D. 9.0 kg

35,990 views

5 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

B. 1.0 kg

C. 2.0 kg

D. 9.0 kg

2.4k points

Your comment on this question:

Email me at this address if a comment is added after mine:Email me if a comment is added after mine

Privacy: Your email address will only be used for sending these notifications.

Email me at this address if my answer is selected or commented on:Email me if my answer is selected or commented on

Privacy: Your email address will only be used for sending these notifications.

24 votes

Answer:

2 kg

Step-by-step explanation:

K.E. = 1/2 m v^2

81 = 1/2 m (9^2)

1 = 1/2 m

m = 2 kg

Siva Prasad answered Aug 18, 2023

3.0k points

Email me at this address if a comment is added after mine:Email me if a comment is added after mine

Privacy: Your email address will only be used for sending these notifications.

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

1.6m questions

2.0m answers