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1. A car travels from a point A to point b at constant speed of 5o km/h. On return journey along the same path, it travels at a constant speed of 40 km/h find its distance travelled, displacement and average speed |
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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 please mark me brain mark list |
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