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Acar initially at rest starts moving with an acceleration of 4 ms. The time in which itpicks up a velocity of 72 ms is dash second |
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Answer» iven that CAR initially at rest MOVING with an ACCELERATION of 4 m/s² acquires a velocity of 72 m/sWe have to find time taken by car to acquire that velocity.SolutionAs the car is initially at rest, so initial speed i.e. u = 0 m/sFinal velocity (v) = 72 m/sAcceleration (a) = 4 m/s² ★ Using 1st equation of MOTION :➝ v = u + atPutting values :➝ 72 = 0 + 4t➝ 72 = 4t➝ t = 72/4➝ t = 18 seconds.Hence, time taken by car to acquire that velocity = 18 seconds.________________________________ ★ Some more equations : ➼ s = ut + ½ at² ➺ h = ut + ½ gt² ➼ v² - u² = 2as ➺ a = (v - u)/t |
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