19. A body starts from rest and moves with uniform acceleration "a" ms. It moves a distance of x, mer in the first t seconds and distance of x, metres in the next t seconds. The distance x,-x, is 12 1) 1/2 at- 2) at 3) 3/2 at 4) 2 at
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AnswerOpen in answr app(a) Invelocity of the truck, u = 0Acceleration, a = 2 m/s2Time, t = 10 sAs per the first equation of motion, final velocity is given as:v = u + at= 0 + 2 x 10 = 20 m/sThe final velocity of the truck and hence, of the stone is 20 m/s.At t = 11 s, the horizontal component (vx) of velocity, in the absence of air resistance, remains unchanged,
so the option is1)1/2
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A car starts from rest and accelerates at uniform rate of 5m/s2 for some time, then moves with contant speed for some time and retards at the same uniform rate and comes to rest. Total time for the journey is 25 sec and average speed for the journey is 20 m/s.
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