Question

a cycle together with its rider weighs 100 kg.how much work is needed to set it moving at 3m/s

Answer 1

THE WORK TO BE DONE TO SET A CYCLE OF 100 KG INTO MOTION WITH A SPEED OF 3m/s is  45 N/m2...(take g=10m/s2).....

Answer 2

Nothing special to do in this question

You know

Kinetic energy = Work done

1/2 mv​2=Work

Therefore

1/2 *100*(32-02)

=50*9=450J

Hope it helps