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anonymous
 5 years ago
an elevator car whose floor to ceiling distance is equal to 2.7 m , starts from rest and ascends with a constant acceleration of 1.2 ms^2 .Two seconds later , a bolt drops from the car's ceiling .The time taken by the bolt to hit the floor of the elevator is
a. 1 s
b. 0.7 s
anonymous
 5 years ago
an elevator car whose floor to ceiling distance is equal to 2.7 m , starts from rest and ascends with a constant acceleration of 1.2 ms^2 .Two seconds later , a bolt drops from the car's ceiling .The time taken by the bolt to hit the floor of the elevator is a. 1 s b. 0.7 s

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0The actual speed at the start doesn't matter, since the bolts relative speed to the car is zero, when it gets loose. So the cars acceleration + the gravitational acceleration gives the bolt's acceleration relative to the car: \[a = g+ 1.2 m /s ^{2} = 11.2 m/s^2\] \[s = a*t^2/2\] \[t=\sqrt{2s/a}= 0.69\approx0.7\] therefore, it's b
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