Question

A boy walks at a speed of2ms-1 for t seconds towards the left then takes a right turn and walks with a speed of 3 ms-1 for the same intervals of time. Calculate the average speed of the boy?

Answer 1

Answer:

average speed = 2.5 m/s

Explanation:

let boy traveled 'x 'metre toward left with speed ,v = 2 m/s in time , ' t ' second

let boy traveled 'd'metre toward right with speed,v1 =3m/s in same time ,'t'sec

therefore , x = v *t = 2 * t =( 2t) metre

d = v1*t = 3 *t = (3t)metre

average velocity of boy = (2t+3t)/(t+t)

= 5t /2t = 2.5m/s