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 stopping a car moving at 40 km/h over a distance of 4.0 m, we will follow these steps:

### Step 1: Convert the speed from km/h to m/s
The initial speed (u) of the car is given as 40 km/h. To convert this to meters per second (m/s), we use the conversion factor:
\[ 1 \text{ km/h} = \frac{1}{3.6} \text{ m/s} \]
Thus,
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