Answer:
a)v=5.81 m/s
b)N= 831.77 N
Step-by-step explanation:
Given that
m = 39 kg
r= 2.98 m
T= 416 N
a)
Lets take speed of the boy at the lowest position is v m/s
The radial force Fc

The tension in the chain is T

Now by putting the values


v²=33.77
v=5.81 m/s
b)
Lets take normal force = N

Now by putting the values



N= 831.77 N