Question

A bus of mass 5000 kg starts from the rest and roles from a hill ifit travells a distance of 200m in 10 seconds calculate :-(1) acceleration (2) force acting on the bus

Answer 1

Answer:

It starts from rest, so u = 0

travels 200m, so s = 200m

time = 10s

let the acceleration = a m/s²

v = u +at = 0 + a×10 = 10a m/s

we know that

v² - u² = 2as

⇒ (10a)² - 0 = 2×a×200

⇒ 100a² = 400a

⇒ 100a = 400

⇒ a = 400/100 

⇒ a = 4 m/s²

mass = 5000kg

force = ma = 5000×4 = 20,000 N = 20 kN