A car travels from stop A to stop B with a speed of 30km/hr and ten travels back to A with speed of 50 km/hr.find (a)displacement of the car (b)distance travelled by the car (c) average speed of the car.
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(a)Displacement is 0 as it returns to the same initial position
(b)let the distance travelled by the car from stop A to B = 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 hours
(c) x/30 + x/50 = 80x/150
Total time = 4x/75 hr
Average speed = Total distance / Total time
= 2x*75/4x
Thus average speed = 37.5 km/hr
Thus total distance = 37.5*2 = 75 m
hope it helps!
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