Question

An object of mass 80 kg is accelerated uniformly from a velocity of 7 m/s to 10 m/s in 5 s.Find the magnitude of the force exerted on the object. ​

Answer 1

Answer:

F =ma=80×10-7÷5=80×0.6 =48

Explanation:

Answer 2

Initial momentum=mass*initial velocity=(80*7)=560kg m/s

Final momentum=mass*final velocity=(80*10)=800 kg m/s

Force=Rate of change of momentum

Force=m(v-u)/t

=100(10-7)/5

=100*3/5=60 N