Both block A and B mass 3kg and are initially 2m above the ground. They slide down a smooth ramp and then across a rough surface with a speed of 4m/s. How much energy did the block lose due to the friction along the rough surface? AND is transformed into what form of energy?

Answer 1

It makes no difference what the mass is or that there are two of them.

When falling H = 2m, if there were no friction the speed would be sqrt(2gH) = 6.26 m/s, but the speed achieveed is only 4 m/s.

(4/6.26)^2 = 41% is the fraction of
energy remaining .
59% is converted to heat.