Question

Hoe much work must be done by a force on 100 kg body to accelerate it form 0 to 20 m/s in 20 s?

Answer 1

Answer:

104J

Explanation:Acceleration that causes the given rise in speed in given time = a=tv​=10 s20 m/s​=2 m/s2

Thus, force acting on the body = F=ma=100 N

Distance travelled in the given time = s=21​at2=100 m

Thus, work done in given time = F.s=104 J