A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of `400m` in `20 s`. Find its acceleration. Find the force acting on it if its mass is `7` metric tonnes (Hint.1 metric tonne=1000kg)

Explanation

To solve the problem step by step, we will use the equations of motion and Newton's second law of motion.

### Step 1: Identify the known values
- Distance traveled (S) = 400 m
- Time taken (t) = 20 s
- Initial velocity (u) = 0 m/s (since the truck starts from rest)

### Step 2: Use the second equation of motion
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