- #1
brnnpink4
- 10
- 0
Homework Statement
A 50Kg box is pulled across the ground with a force of 250 N. The speed of the box is a constant 4m/s for 3 seconds. Friction is NOT 0.
a) What is the net work done on the box by all forces ?
b) How much work is done on the box by applied forces?
c) What is the work done by the friction on the box?
d) What is the power output of the applied force?
e) If there were no friction, and the force was applied for 8m, what would the resulting speed be if the box started from rest?
Homework Equations
f=ma
KE=.5mv^2
PE=mgh
P=fvcosx
The Attempt at a Solution
b) w=250d
c)w=frkd (Friction constant and distance are what I can't find)
d) p=w/3
e)
I guess what is mostly stumping me on these problems is the fact that I don't know how to find the distance or the spring constant