Answer:
Explanation:
a ) see attached file
b )
weight of man = 80 x 10 = 800 N
scale reading = 1000N .
Since scale reading is more than his weight , the elevator must be moving upwards .
Net force upwards = R - mg , R = reaction force = 1000N
Net force upwards = 1000 - 800 = 200 N
acceleration = net force / mass
= 200 / 80 = 2.5 m / s²
c )
If T be the tension
T - ( 80 + 1120 ) g = ( 80 + 1120 ) x 2.5
T = 15000 N
