Question

Q18. A boy starts from a point A, travels to a point B at a distance of 3 km from A and returns
to A. If he takes two hours to do so, his speed is
(a) 3 km/h
(b) zero
(C) 2 km/h
(d) 1.5 km/h​

Answer 1

Answer:

velocity=distace/time

v=6/2

v=3km/hr

Answer 2

Option(a) is correct.

Concept:

The ratio of distance travelled to the time it took to go it is used to calculate speed. Because it just has a direction and no magnitude, speed is a scalar number.

The entire distance travelled by an object is divided by the time it took to traverse that distance to get its average speed. It's a scalar quantity, which means its magnitude is the sole thing that defines it.

Find:

Speed of the boy.

Solution:

Total distance travelled by the boy is $6km$.

Total time taken by the boy is $2hrs$.

$speed = \frac{distance}{time}\\\\speed=\frac{6}{2}\\\\speed = 3km/hr$

Hence, the speed is $3km/hr$. Option(a) is correct.

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