Homework Statement
Two skaters stand face to face. Skater 1 has a mass of 55 kg, and skater 2 has a mass of 75 kg. They push off one another and move in opposite directions. What is the ratio of skater 1's speed to skater 2's speed?
Homework Equations
KE=0.5*m*v^2
The Attempt at...
So we can use equation W=(delta)KE right? but what is the initial KE and final KE... I am sorry
should the initial velocity be 30.9m/s and the final velocity 0m/s?? I am going to use W=1/2m(finalvelocity^2-initialvelocity^2)
Thanks for help :D
Homework Statement
In a crash test, a test car of mass 1734 kg is moving at a speed of 30.9 m/s (= 69.5 miles per hour) when it crashes into a wall. If the car comes to rest in 0.8 s, how much average power (in W) is expended in this process?
Homework Equations
P=W/t to find "P"
W=Fd...