A truck starts from rest down a hill with a constant acceleration. It achieves 400 meters in 20 seconds. If the weight of the truck is 7 tons then what will be the force acting on it?
- A12000 Newtons
- B11000 Newtons
- C13000 Newtons
- D14000 Newtons
Show answer and explanation
Correct answer: (d) 14000 Newtons
Explanation
From rest, s = ut + ½at² gives 400 = ½ × a × 20², so a = 2 m/s².
Mass = 7 tonnes = 7000 kg.
By Newton's Second Law, F = ma = 7000 × 2 = 14000 N.