A lamp hangs vertically from a cord in a descending elevatorthat decelerates at

Question

A lamp hangs vertically from a cord in a descending elevatorthat decelerates at 3.0 m/s2. (a) If the tension in thecord is 53 N, what is the lamp's mass? (b) What is the cord'stension when the elevator ascends with an upward acceleration of3.0 m/s2? i dont know why my anwser are wrong. I got a) 8.41 b) 108 Thank you A lamp hangs vertically from a cord in a descending elevatorthat decelerates at 3.0 m/s2. (a) If the tension in thecord is 53 N, what is the lamp's mass? (b) What is the cord'stension when the elevator ascends with an upward acceleration of3.0 m/s2? i dont know why my anwser are wrong. I got a) 8.41 b) 108 Thank you

Explanation / Answer

   When the elevator descending        Tension T = m (g-a) = m(9.8 + 3.0 )    therefore mass m = T / 12.8 = 4.14kg when the elevator ascending          Tension T = m (g+a)                         = 4.14 ( 9.8 + 3) = 53 N

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