Question

You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30.0 m/s. Calculate the kinetic energy.

Answer 1

Explanation:

You have just given the ball kinetic energy, which is given by the following equation:

Ek=0.5×m×v2

So the energy the ball has the moment after you hit it is:

Ek=0.5×2.1×(30)

Ek = 945J

Answer 2

KE = 1/2mv²

Here m= 2.1kg and v= 30m/s

So, KE = 1/2×2.1×(30) ²

= 1/2×2.1×900

= 945J

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