Question

an athlete starts running along a circular track of radius at a speed of 5 metre per second in clockwise direction for 40 seconds then the athletes reverse direction and runs in a anticlockwise direction 3 metres per second for 100 sec at the end . displacement of the runner from the starting point is


A. 84.15 m
B. 83 m
C. 80 m
D. 85 m​

Answer 1

Answer:

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Answer 2

Solution :-

given that,

→ S1 = 5 m/s

→ T1 = 40 seconds .

so,

→ D1 = S1 * T1 = 5 * 40 = 200 m (In clockwise direction)

and,

→ S2 = 3 m/s

→ T2= 100 seconds .

so,

→ D2 = S2 * T2 = 3 * 100 = 300 m . (In anti clockwise direction) .

then,

→ The displacement of the runner from the starting point = + 200 + (-300) = 200 - 300 = (-100) = 100 m (In anti clockwise direction) .

therefore, required displacement is 100 m .

Learn more :-

The speed of a moving object is determined to be 54km/h. This speed is equal to a. 15m/s b. 10m/s c. 5m/s d. 20m/s

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