Question

A car travels from stop A to stop B with a speed of 30 km/hr and then returns
back to A with a speed of 50km/hr. Find :
i) Displacement of the car
ii) Distance travelled by the car
iii) Average speed of the car​

Answer 1

Explanation:

The displacement of the car is 0 m/s

let the distance travelled by the car from stop B to A= x km

the car travels from A to B and returns back to B

thus total distance travelled = 2x km

time while going from A to B

Distance travelled/ speed taken

x/ 30

time while returning from stop B to A= x/ 50 hours

total time x/30+x/50 =8x/ 150

total time 4x/ 75

AVERAGE SPEED = total distance/ time taken

average = 37.5 km

thus total distance 2x= 2× 37.5 = 75m