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Grade: 12th pass
        From airlift moving upward with a uniform acceleration a barabar to metre per second square and throws a ball vertically upward with velocity V equal to 12 metre per second related to the left the ball comes back to the main after a time to find the value of t find the value of
9 months ago

Answers : (1)

Arun
13923 Points
							
Dear student
 
 
Take case with respect to the lift
Upward velocity with respect to lift v
As lift is moving upward with a acceleration
acceleration of ball with respect to the lift = acceleration of the ball – acceleration of lift
       =  – g – (a)  =  – (g+a)
using s=ut+(1/2)at2
as it again comes back to same position with respevt to lift therefore displacement is zero
 
0 = vt -(1/2)(a+g)t2
vt=(1/2)(a+g)t2
a+g = 2v/t
 
Now always remember this in this type of questions.
Hence
2 + 10 = 2 *12/t
12 = 24/t
t = 2 sec
 
 
Regards
Arun (askIITians forum expert)
9 months ago
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