A body of mass 0.8 kg has intial velocity `(3hati-4hatj) ms^(-1)` and final velocity `(-6hatj+2hatk) ms^(-1)`. Find change in kinetic energy of the body?

Explanation

To find the change in kinetic energy of the body, we will follow these steps:

### Step 1: Calculate the initial velocity magnitude
The initial velocity \( \mathbf{v_i} \) is given as \( \mathbf{v_i} = 3\hat{i} - 4\hat{j} \) m/s. To find the magnitude of the initial velocity, we use the formula:

\[ |\mathbf{v_i}| = \sqrt{(3)^2 + (-4)^2} \]
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