Question

A lift of mass 100 kg starts moving from rests in the
upward direction. Fig. shows the variation if speed
of the lift T T, and T, stand for tension in the rope
form zero to two seconds, two to six seconds, six to
seven seconds respectively then :-
Velocity (m/sec)
6
7 → t(sec)
0 2
(A)T,: T2: Tz:: 1:1:1
(B) T, :T,: Tz::6:5:3
(C)T, :12:12::3:5:6
(D) T, :T,: Tz:: 6:5:6​

Answer 1

Answer:

answer is option B (T,: T,: Tz::6:5:3

Step-by-step explanation:

T1 = 0to2

T2= 2 to 6

T3= 6 to 7

equation of motion T = m(g+a)

slope of the respective time interval is 2,0,-4

for T1   =m(g=a)

a= 2m/s^2

  = 100(10+2)

  =  1200

for T2 = m(g+a)

a = 0m/s^2

  = 100(10+0)

   =  1000

for T3 = m(g+a)

   a= -4m/s^2  

     = 100(10-4)

     = 600

T1:T2:T3  = 1200:1000:600

               =12 :10: 6

                 = 6: 5: 3