Question

8. By how much will the speed of a body, of fixed mass, increase if its kinetic energy
becomes four times its intial kinetic energy? (1)
9. Define 1 J of work. (1)​

Answer 1

Answer:

8)K.E=1/2mv^2

K E directly proportional to v^2

4*1/2mv^2=4KE

=2mv^2

v increased by 2times

9) work is said to be 1J force applied on object is 1N

and displacement is 1m if displacement and force are in Same direction