Recent content by zedx

KE=1/2m*v^2, KE =kinetic energy, m=mass, v=velocity Mass comes back with half of its kinetic energy. Its initial KE=4 so on the way back it's equal to 2 KE=2=1/2m*v^2 multiply each side by 2: 4=m*v^2, v=2m/s so v^2=4: 4=m*4 divide each side by 4 m=1.0 kg Got the answer...

So I should use KE = 1/2 m * v^2 to solve this problem, correct? And I should solve for the mass, correct?

Homework Statement An object of mass m moving in a certain direction has a kinetic energy of 4.0 J. It hits a wall and comes back with half its original kinetic energy. Homework Equations If the speed of the object on return is 2.0 m/s, what is the mass of the object? A) 2.8 kg B) 3.8 kg...

I'll do all of the above. Thank you.

Homework Statement A 10.0-kg mass is placed on a 25.0o degree incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.580, and the coefficient of sliding friction is 0.520. The mass is given a shove causing it to slide down the incline. Homework...