I know that option (a.) is correct but why not (d.). Plz help:)

Question

I know that option (a.) is correct but why not (d.).   Plz help:)

maheshmeghwal9 · Answer

A ball is dropped vertically from a height 'd' above the ground and bounces up vertically to a height 'd/2'. Neglecting subsequent motion & air resistance its velocity 'v' varies with the height 'h' above the ground as: -

maheshmeghwal9 · Answer

http://assets.openstudy.com/updates/attachments/4fd99378e4b091dda540fe94-maheshmeghwal9-1339659177410-1.jpg

maheshmeghwal9 · Answer

@shubhamsrg Plz help:)

shubhamsrg · Answer

velocity^2= 2gh (assuming u=0)
so velocity vs distance cant be a straight line (option c is ruled out)
now from a,b,d..b and d cant be the soln as velocity has to change sign as it collides..
only option a has that..so i guess thats the ans

maheshmeghwal9 · Answer

but what about this|dw:1339670312013:dw|
or it should be|dw:1339670355559:dw|