An open elevator is ascending with zero acceleration and speed 10 m/s. A ball is thrown vertically up by a boy (boy is in elevator) when he is at a height 10 m from the ground, the velocity of projection is 30m/s with respect to elevator. Choose correct option(s) assuming height of the boy very small : (g = 10 m/s 2 )
Text Solution
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(a,b,c,d)
Absolute velocity of ball = 40 m/s (upwards)
h max = h i = f f = 10 + 
h = 90 m
Maximum height from lift = 
= 45 m
The ball unless meet the elevator again when displacement of ball = displacement of lift
40 t – 
× 10 × t 2 = 10 × t ⇒ t = 6s.
with respect to elevator V ball = 30 m/s downward ∴ V ball with respect to ground = 30 – 10 = 20 m/s
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