Answer to Question #727 in Mechanics | Relativity for Brian
upward acceleration and moves 1m in the first
1.5 s. A passenger in the elevator is holding a
9.6 kg bundle at the end of a vertical cord.
The acceleration of gravity is 9.8 m/s2 .
What is the tension in the cord as the ele-
Answer in units of N.
T = mg + ma = 9.6 (9.8 + 0.9) = 102.7 N
Answer: 102.7 N.
Because we have gravity force and elevator acting on the object and gravity also contributes into value of tension
why does T=mg+ma instead of just T=ma?