First slide

Pseudo force

Question

The mass of a lift is 2000 kg. When the tension in the supporting cable is 28000 N, then its acceleration is :

Easy

A

14 ms^-2,upwards
B

30 ms^-2 downwards
C

4 ms^-2 upwards
D

4 ms^-2 downwards

Solution

T - mg = ma
= 28000 - 20000 = 2000 a
= a = 4m/s²

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