Question

An athlete runs two rounds of a circular track of radius 45m by exerting a force of 200 N against the friction due to ground. Find the work done by him and justify your answer.​

Answer 1

Answer:

W=52560J

Explanation:

W=Fxs

S=2πr

R=45

F=200

Answer 2

Dear Student,

● Answer -

W = 113100 J

● Explaination -

# Given -

n = 2 rounds

r = 45 m

F = 200 N

# Solution -

Total distance covered by the athlete -

s = n × 2πr

s = 2 × 2 × 3.142 × 45

s = 565.5 m

Work done by the athlete is calculated as -

W = F.s

W = 200 × 565.5

W = 113100 J

Hence, work done by the athlete is 113100 J.

Hope this helps you...