Question

a force acting on body of mass 25 kg changes velocity from 25m/s to 40m/s in 3 s. find the force​

Answer 1

Explanation:

a=40-25/3

a=5

F=ma

F=25×5

F=125N

Answer 2

Answer:

Given

Mass (m)=20kg

Initial velocity u =5m/s

Final velocity v= 2m/s

K.E=½m(m²-u²)=½×20×(2²-5²)=-210j

Explanation:

Here the negative sign implied the retarding use of nature of the applied force