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l is thrown vertically upward attains a maximum hoight of 45 m. The timo after which velocity of the balbecome equal to haif the velocity of projection? (use g 10 m/s(1) 2s(3) 1sof the baltlNo(2) 1.5 s(4) 0.5s |
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Answer» Let the initial velocity is U and given the maximum height is 45m , at which V = 0 so, v² = u²-2gh => u² =2*10*45=> u = √900 = 30m/s now time when V = u/2 = 30/2 = 15m/s is V = u -gt ==> 15 = 30-10t => t = 15/10 = 1.5sec |
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