Hey can anyone help me with this, Its from this impossible m2 mock paper!!.
4) The resistance to the motion of a cyclist is modelled as kv^2 N , where k is a constant and v m/s is the speed of the cyclist. The total mass of the cyclist and his bicycle is 100kg. The cyclist freewheels down a slope inclined at an angle & (theta) to the horizontal, where sin& = 1/20 , at a constant speed of 3.5m/s.
a) Show that k=4
The cyclist ascends a slope inclined at an angle B to the horizontal, where sin B = 1/40 , at a constant speed of 2 m/s.
b) Find the rate at which the cyclist is working.
Thank u and gd luck!