A bullet moving with a speed of `150ms^-1` strikes a tree and penetrates 3.5 cm before stopping. What is the magnitude of its retardation in the tree and the time taken for it to shop after striking the tree?

Explanation

To solve the problem, we will follow these steps:

### Step 1: Identify the given values
- Initial velocity of the bullet, \( u = 150 \, \text{m/s} \)
- Final velocity of the bullet, \( v = 0 \, \text{m/s} \) (since it stops)
- Distance penetrated into the tree, \( x = 3.5 \, \text{cm} = 3.5 \times 10^{-2} \, \text{m} \)

### Step 2: Use the kinematic equation to find retardation (negative acceleration)
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