How much force is required to stop a bus ( in 10 seconds) of mass 5000 kg moving with a speed of 72 km/h?

Explanation

To solve the problem of how much force is required to stop a bus of mass 5000 kg moving with a speed of 72 km/h in 10 seconds, we can follow these steps:

### Step 1: Convert the speed from km/h to m/s
The initial speed \( u \) is given as 72 km/h. To convert this to meters per second (m/s), we use the conversion factor \( 1 \text{ km/h} = \frac{1}{3.6} \text{ m/s} \).

\[ u = 72 \text{ km/h} = \frac{72}{3.6} \text{ m/s} = 20 \text{ m/s} \]
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