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10.A racing car starts from rest & moves with constant acceleration. If it CrUSSES DEpoint of 1 Lap after 160 min, with a velocity of 180 kmph then find length of theLap.b) 240kmc) 360kma) 120kmd) 480kmftor 10 min it crosses a small station

Answer»

c is the right answer

Usingv = u + at

v = 180 km/hru = 0t = 160 min = 160/60 = 8/3 hr

180 = 0 + a*8/3a = 180*3/8 = 67.5

Now, using s = ut + 1/2 * a * t^2 s = 0*8/3 + 1/2 * 67.5 * 8/3 * 8/3s = 0 + 67.5 * 4/3 * 8/3s = 67.5 * 32/9s = 7.5 * 32 = 240 km

Therefore, Length of lap = 240 km

(b) is correct option

thank you



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