Question

An object of 100 kg is accelerated uniformly from a velocity 36 km/hr to 108 km/ hr calculate the initial and final momentum of th object . also fine force

Answer 1

Mass = m= 100kg

To convert km/h into m/s, 1 km = 1000 m , 1 hr = 3600 sec

⇒ 1km/h= $\frac{1000}{3600}$ = $\frac{5}{18}$

∴ Initial Velocity=u= 36km/hr = 10m/s

Final velocity =v= 108km/hr = 30m/s

Initial momentum= m×u = 100×10= 1000 kg.m/s

Final momentum= m×v = 100×30= 3000 kg.m/s

To calculate Force we need time which is not mentioned.

Force×Time=Change in momentum=Final momentum-Initial Momentum