Question
Question: An elevator and its load have a total mass of 800 kg. Find the tension in the supporting cable when ...
An elevator and its load have a total mass of 800 kg. Find the tension in the supporting cable when the elevator, moving downward at 10 m/s, is brought to rest with constant acceleration in a distance of 25 m. (Take g = 10 m/s2) :
A
6400 N
B
8000 N
C
9600 N
D
Zero
Answer
9600 N
Explanation
Solution
v2 = u2 + 2as 0 = 100 + 2a(25)
a = –2 m/s2
T = m(g – a) (downwards)