Answer to Question #63603 in Physics for Rabia

Question

i needed help on a few physics questions if you please(this is energy unit:
1) Girl skis straight down a 25 degrees slope, starting from rest and travelling a distance of 17m along the slope. Use Conservation of energy to find her final velocity, assuming negligible air resistance and friction.
2)A child swings on a swing so that her center of mass is located 86cm above the ground and 3.46m from the point where the rope is attached to the tree. If she swings so that her maximum amplitude causes the rope to make an angle of 48 degrees with the vertical, calculate the child's maximum speed at the bottom of the swing.
3) A 25kg block slides 12 meters on level ground before coming to rest. If 760J of energy were required to overcome friction, calculate the coefficient of kinetic friction between the block and ground.