Question

A boy completes a semicircle of radius 7 m in 5 second. The distance travelled by the boy is
(a) 7 m
(b) 10m
( c )11 m
(d) 22 m​

Answer 1

Answer:

your answer is (c) 11m

Explanation:

Speed=timedistance travelled

=half of the circumference/time

=1/2×2×π×r/2

=1×2×π×r/2×2

=1×2×22×7/4×7

=11m

Speed and velocity can be equal for uniform motion along a straight line.

hope it helps you

Answer 2

Given:

A boy completes a semicircle of radius 7 m in 5 second

To find:

The distance traveled by the boy

Solution:

It is given in the question that the boy is covering the semicircular part in just 5 seconds.

And the radius of the semicircle is 7 cm.

So it is very clear that the distance covered by the boy is the circumference of the circular part of the semi-circle.

In this case, the circumference of the semi-circle will be = πr

22/7×7

22 m

So, The distance traveled by the boy is 22m