1. A 12 kg dog is running 5 m/s. How much kinetic energy does the dog have? 2. Another dog is also running at 5 m/s, but this one has 100 Joules of kinetic energy. What is this dog's mass?

1.

2.

Explanation:

1. KE = 1/2mv^2

= 1/2 (12)×5^2

= 6× 25

KE = 150j

2. KE = 1/2 mv^2

100j = 1/2m(5)^2

2(100j) = m×25

m = 200÷ 25

m = 8 kg

hope it helps

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