Question

A boy completes a semicircle of radius 7 m in 5 second. The displacement of the boy is



7 m

10 m

11 m

14 m

​

Answer 1

Answer:

14

Explanation:

this is bcoz displacement is the shortest possible way to go

Answer 2

Answer:

The displacement of the boy is 14 m.

Explanation:

What is displacement?

Displacement is defined as the shortest distance (a straight line) drawn and measured between the initial and final points that the object has moved.

What is distance?

Distance is a measure of 'how much' the object has gone through the time it was in motion.

For e.g., a person completing a whole rotation around a circle will cover a distance = the circumference of the circle, but the displacement of the person will be zero.

Calculation:

Since the boy is moving around a semicircle, the displacement of the boy would be = 2r = diameter of the semicircle.

Given, radius (r) = 7 m

∴ Diameter of the semicircle = displacement of the boy = (2 × 7) = 14 m.

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