Question

A lift is going up with variable velocity as shown in figure. If mass of the lift is 2000 kg, then tension in the rope of lift at t = 5 sec is

• A. 20 kN
• B. zero
• C. 24 kN
• D. 16 kN

Answer 1

The correct option is D 16 kN

Slope of graph gives acceleration, $a=\frac{0-20}{10-0}=-2m/s^2$

Tension in the rope is T = m(g + a)
= 2000(10 - 2)
= 16 kN [Independent of time]