A rolling ball has 21 joules of kinetic energy and is rolling 7 m/s. Find its mass.

2 and 1.

step-by-step explanation:

plug in each answer. 0 doesn't work, 1 does. so does 2. 4 doesn't:

0 = 1 is not true.

2 = 2 is true.

4 = 4 is true.

8 = 16 is not true.

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50*10 is greater

step-by-step explanation:

if you add the zero from 10 to 50, it will give you a bigger number.

the k side

step-by-step explanation:

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