Question

a force F is required to keep a 5kg mass moving round a cycle of radius 4m at a speed of 8m/s. calculate the speed,if the force is tripped

Answer 1

F= m v^2/R = 5 * 64 /4 = 80 Newtons
3 * 80 = 5 v^2/4
v^2 = 192
v = 13.9 m/s

Answer 2

How do u get 64