Question

# A body of mass of $60kg$ Is, moving with a speed of $50m{s}^{-1}$. Find its kinetic energy.

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Solution

## Step 1: Given dataMass of the body, m = 60 kg.Speed of the body, v = 50 m/s.Step 2: Kinetic energyThe total amount of work done to move a body from one place to another is called kinetic energy.Kinetic energy, ${E}_{k}=\frac{1}{2}m{v}^{2}$, where m is the mass of the body and v is the speed of the body.For a rested body, kinetic energy is zero.Step 3: Finding the kinetic energyLet ${E}_{k}$ be the kinetic energy of the body.Now, ${E}_{k}=\frac{1}{2}×60×{\left(50\right)}^{2}=75000$$⇒{E}_{k}=75000J$ The kinetic energy of the body is 75000 J.

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