Question

a force of 20N acts on a body of 2kg for 3 seconds .find the kinetic energy in 3 seconds​

Answer 1

Answer:

Force = mass × acceleration

F=10N

m=2kg

then,

a=mF=210=5m/s2

(i) Now, 

u=0

t=3sec

v=u+at=0+3×5=15m/s

(ii)Initialmomentum=mu=2×0=0

       Finalmomentum=mv=2×15=30kg−m/s

Change in momentum=Final momentum - Initial momentum 

                                    =30−0=30kg−m/s

Explanation:

hope it help you!

Answer 2

Answer:

See your answer above .........