InterviewSolution
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InterviewSolution
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In the question number 52, the speed with which the stone hits the ground isA. 15 m `s^(-1)`B. 90 m `s^(-1)`C. 99 m `s^(-1)`D. 49 m `s^(-1)` |
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Answer» Correct Answer - C Motion along horizontal direction, `downarrow +ve` `u_(x) = 15 ms^(-1), a_(x) = 0` `v_(x) = u_(x) + a_(x)t = 15 + 0 xx 10 = 15 ms^(-1)` Motion along vertical direction, `u_(y) = 0, a_(y) = g` `v_(y) = u_(y) + a_(y)t = 0 + 9.8 xx 10 = 98 ms^(-1)` `therefore` Speed of the stone when it hits the ground is `v = sqrt(v_(x)^(2) + v_(y)^(2)) = sqrt((15)^(2) + (98)^(2)) ~~ 99 ms^(-1)` |
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