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BPSC – Combined Competitive Examination · Question 122

A truck starts from rest down a hill with constant acceleration. It covers 400 m in 20 s. If the mass of the truck is 7 tonnes, what is the force acting on it?

  1. 11000 N
  2. 12000 N
  3. 13000 N
  4. 14000 N
Show answer & explanation

Answer: (D) 14000 N

Explanation

a = 2s/t² = 800/400 = 2 m/s²; F = ma = 7000 × 2 = 14000 N.

  • (A) Incorrect

    Wrong: F = 7000 × 2 = 14000 N.

  • (B) Incorrect

    Wrong: F = 7000 × 2 = 14000 N.

  • (C) Incorrect

    Wrong: F = 7000 × 2 = 14000 N.

  • (D) Correct

    Correct: s = ½at² → 400 = ½a(400) → a = 2 m/s²; F = 7000 kg × 2 = 14000 N.