1.

A car travels from point A to point B at constant speed of 50 km/h . On return journey along the same path, it travels at a constant of 40 km/h. Find its distance travelled, displacement and average sped

Answer»

Let the distance between A and B be x
SPEED ¹ = 50KMPH
THEREFORE time TAKEN = x/50

return journey
speed ²=40kmph
time taken = x/40

total distance travelled =x+x=2x km
displacement =0
average speed = total distance/total time
= 2x/(x/50+x/40)
= 2x÷[ x(40+50)/200]
= 2*200/90
= 45 kmph



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