Pls help with physics?

Science & Mathematics by Anonymous 2018-05-18 11:08:37

Social Science

2 answers

And 80 kg skateboarder in motion has 760 J of kinetic energy while about to go down 3 m tall ramp. What will his speed be at the bottom of the ramp?

Anonymous

0, he fell and it was really epic.
Anonymous

He started with 760 J He gained energy from gravity = mgh = 80 * 9.8 * 3 = 2352 J the total energy is now 2352+760= 3112 J The energy Ek = 3112 J 1/2 m v^2 = 3112 -> v^2 = 2*3112/80 v = sqrt(2 * 3112 / 80) ~= 8.8 m/s