Question

3 A body travels from A to B at 40 m/s and from B to A at 60 m/s. Calculate the

average speed and average velocity.

answer fast
urgent!!​

Answer 1

Answer:

average speed=

$\frac{v + u}{2}$

$\frac{40 + 60}{2}$

$\frac{100}{2}$

$50m {s}^{ - 1}$

Answer 2

A body travels from A to B at 40 m/s and from B to A at 60 m/s.

Let the distance from A to B be D

v1 = 40 m/s

v2 = 60 m/s

AVERAGE SPEED :

Total time taken = time taken to travel from A to B + time taken to travel from B to A.

t = t1 + t2

2D/v = D/v1 + D/v2

2/v = 1/v1 + 1/v2

$v \: = \frac{2(v1v2)}{v1 + v2}$

v = 2(40)(60)/(40+60)

= 4800/100

= 48 m/s

Average speed = 48 m/s

AVERAGE VELOCITY :

Since it returns to initial point A, total displacement is zero.

hence, Average velocity = zero

hope it helps..!