Gogo on ice - A lesson of friction #shorts

An ideal lesson plan is

You move a stone of glass on the cemented floor, marble floor, water, towel and on ice. The force of friction acting on the different surfaces in increasing orde3r will be:

A stone weighing 1 kg and sliding on ice with a velocity of 2 m / s is stopped by friction in 10 sec . The force of friction (assuming it to be constant) will be

A man is standing in the middle of a perfectly smooth 'island of ice' where there is no friction between the ground and his feet. Under these circumstances .

A 42 kg block of ice moving on rough horizontal surface stops due to friction, after sometime. If the initial velocity of the decelerating block is 4ms^-1 , the mass of ice (in kg) that has melted due to the heat generated by the friction is (Latent heat of ice is 3.36xx10^5Jkg^ -1

A 55.0 kg ice skater moving at 8.5 m/s glides to a stop. Assuming the ice is at 0^(@)C and that 50 percent of the heat generated by friction is absorbed by the rice, how much ice melts?