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

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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

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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

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