Three smooth stones, A, B and C are initially at rest, in contact with each other on the smooth surface of a frozen lake. The masses of the stones are A = 400 g, B = 300 g and C = 120 g and the coefficient of sliding friction between the stones and the ice is μslide = 0.0150. An explosion between the stones causes them to fly apart across the surface of the ice. Stone A flies off due North with an initial speed of 4.50 m s−1. Stone B flies off due east with an initial speed of 6.60 m s−1.
Calculate the speed and direction of motion of stone C immediately after the
explosion. [10 marks]
The Attempt at a Solution
there isn't a collion taking place...so momentum formula i don't think needs to be used.
we need to calculate speed of C.
mass of C= 0.12kg
μslide = 0.0150
F=ma = uR
dont know R or a...?
need help here...