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2.Motion in Straight Line
hard
$d$ ઊંચાઇના ટાવર પરથી એક બોલને મુકત કરવામાં આવે છે.તે જમીન સાથે અથડાઇને $d/2$ ઊંચાઇ સુધી જાય છે.તો બોલનો વેગ વિરુધ્ધ ઊંચાઇનો આલેખ કેવો મળે?
A

B

C

D

(IIT-2000)
Solution
(a)For the given condition initial height $h = d$ and velocity of the ball is zero.
When the ball moves downward its velocity increases and it will be maximum when the ball hits the ground & just after the collision it becomes half and in opposite direction.
As the ball moves upward its velocity again decreases and becomes zero at height $d/2$.
This explanation match with graph (A).
Standard 11
Physics