A string exerts a tension force of 55N on a 10kg block as it moves a distance of 5m up a frictionless incline. The string pulls parallel to the incline.
A) Find the total external work done on the block-earth system as the block moves 5m up the incline.
B)Find the change in gravitational potential energy for the block-earth system as the block moves 5m up the incline.
C)Find the change in kinetic energy for the block-earth system as the block moves 5m up the incline.
Our teacher tells us to round gravity up to 10m/s/s.
The Attempt at a Solution
A)The external force should be the tension, so:
[tex](55N)(5m) = 275J[/tex]
B)I used trig (3-4-5 triangle) to find the height to go up 3m.
I am not sure what to do here because I don't know how to solve for velocity.