Question

an object starting from rest accelerates at a constant 5 M per second square in 4 second what will be change in kinetic energy

Answer 1

Put the value 5 in place of 25

For constant acceleration, use the equations of motion. you have 3 quantities given in this problem:

Initial speed u=0 (rest)

Acceleration a=25 m/s^2

Time t=5 so

Final speed v=?

Use v=u+at=0+25(5)=125 m/s