1.

Se WIL LILLIUc) 15b) 10 sa) 5sA bus is moving with a constant speed of 75 kmph. The driver observes the redSignal and applies the brakes. If the speed of the bus reduces uniformly to 21kmph in 3s find the retardation produced in the bus.d) 6m/s2a) 3m/s2b) 4m/s2c) 5m/s2hill celerates uniformly with 0.5 m/s2 to

Answer»

Usingv = u + at

v = 21 km/hr = 21*5/18 = 35/6 m/su = 75 km/hr = 75*5/18 = 25*5/6 = 125/6 m/st = 3 s

35/6 = 125/6 + a*33a = 35/6 - 125/63a = - 90/6 = - 15a = - 15/3 = - 5 m^2/s

-ve sign show retardation

(c) is correct option



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