callmelako017 callmelako017

15-04-2022
Physics

contestada

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

Respuesta :

jsimpson11000 jsimpson11000

15-04-2022

Answer:

2 kg

Explanation:

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

81 = 1/2 m (9^2)

1 = 1/2 m

m = 2 kg

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