BPSC – Combined Competitive Examination · প্রশ্ন 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?
উত্তর দেখান ও ব্যাখ্যা
উত্তর: (D) 14000 N
ব্যাখ্যা
a = 2s/t² = 800/400 = 2 m/s²; F = ma = 7000 × 2 = 14000 N.
- (A) ভুল
Wrong: F = 7000 × 2 = 14000 N.
- (B) ভুল
Wrong: F = 7000 × 2 = 14000 N.
- (C) ভুল
Wrong: F = 7000 × 2 = 14000 N.
- (D) সঠিক
Correct: s = ½at² → 400 = ½a(400) → a = 2 m/s²; F = 7000 kg × 2 = 14000 N.