A car moving at 40 km/h is tobe stopped by applyin brakes in the next 4.0 m. If the car weighs 2000 kg, what average force must be applied on it?

Explanation

To solve the problem of determining the average force required to stop a car moving at 40 km/h over a distance of 4.0 m, we can follow these steps:

### Step 1: Convert the speed from km/h to m/s
The initial speed of the car is given as 40 km/h. We need to convert this to meters per second (m/s) for our calculations.

\[ \text{Speed in m/s} = \frac{40 \text{ km}}{1 \text{ h}} \times \frac{1000 \text{ m}}{1 \text{ km}} \times \frac{1 \text{ h}}{3600 \text{ s}} = \frac{40000 \text{ m}}{3600 \text{ s}} \approx 11.11 \text{ m/s} \]
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