Question

A ball masss 0.2 kg is tied to the end of the string and whirled in a horizontal circle of the radius 0.4m if ball complete 10 revolution in 4 s determine the. Linear speed and centeripetal acceleration and force

Answer 1

But i am not understand this condition of question

Answer 2

the distance of one revolution is the circumference of the circle

C = 2πr = 0.8π m
The frequency is 10rev/4s = 2.5 Hz
so the linear speed is v = 0.8πm * 2.5/s = 2π m/s
as usual,
the acceleration is a = v^2/r
force F = ma