Question

An object is moving with a speed of 20.msand has 400 J of kinetic energy.

Answer 1

Answer:

2kg mass

Explanation:

I have a feeling that your question is complete. seems like you are asking what is the mass of the object.

E.k.= 1/2 * mv²

400 = 1/2 * m* 20²

400 = 200m

m = 2 kg