Need help with a Physics question about momentum, teacher won't teach.

Physics
Tutor: None Selected Time limit: 1 Day

Dec 1st, 2015

Thank you for the opportunity to help you with your question!

Thank you for the opportunity to help you with your question!

1)first we have to find the work

work=force*distance

=400*3

=1200 Nm

so the power=work/time

power=1200/20

power=60 W


2)A.momentum

3)total energy it constant

but @ point Q the kinetic energy change to potential energy

so the answer is C

4)the potential energy @ top of hill=mgh

m-mass

g=9.81

h=height=12

potential energy=20*9.81*12

=2534.4 J


so it need same amount of kinetic energy at initial

so the need kinetic energy=2534.4 j

Please let me know if you need any clarification. I'm always happy to answer your questions.Please let me know if you need any clarification. I'm always happy to answer your questions.
Dec 1st, 2015

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