Question

A car travels from stop A to stop B
with a speed of 30 km /h and then returns
back to A with a speed of 50 km/h find.
1- displacement of the car
2- distance travelled by the car
3- average speed of the car​

Answer 1

Answer:

1. dispalcement of car = 0

2. average speed = 37.5kmph

Explanation:

Case1: when car travel from A to B

speed v1 = 30kmph

let distance d1 = x

=> time t1 = x/30 h

Case2: when car return back

speed v2 = 50kmph

distance d2 = x

=> time t2 = x/50 h

Now, total time T = x/50 + x/30 = 4x/75 h

total distance D = 2x

•°• average speed of car = D/T

= 2x/(4x/75) = 37.5 km/h