A body of mass 5 kg starts from the origin with an intial with an intial velocity ` vec (u) = 30hat(i) + 40hat(j).` . If the body collides with a wall and after collision its velocity becomes` vec(v) = - 30 hat (i) + 40 hat (j) ,` then what is change in momentum of body ?

Explanation

To find the change in momentum of the body, we can follow these steps:

### Step 1: Identify the given values
- Mass of the body, \( m = 5 \, \text{kg} \)
- Initial velocity, \( \vec{u} = 30 \hat{i} + 40 \hat{j} \, \text{m/s} \)
- Final velocity, \( \vec{v} = -30 \hat{i} + 40 \hat{j} \, \text{m/s} \)

### Step 2: Write the formula for change in momentum
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