BPSC – Combined Competitive Examination · வினா 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?
விடையைக் காட்டு & விளக்கம்
விடை: (D) 14000 N
விளக்கம்
a = 2s/t² = 800/400 = 2 m/s²; F = ma = 7000 × 2 = 14000 N.
- (A) தவறு
Wrong: F = 7000 × 2 = 14000 N.
- (B) தவறு
Wrong: F = 7000 × 2 = 14000 N.
- (C) தவறு
Wrong: F = 7000 × 2 = 14000 N.
- (D) சரி
Correct: s = ½at² → 400 = ½a(400) → a = 2 m/s²; F = 7000 kg × 2 = 14000 N.