Physics is all about understanding concepts! (2)
Classical Mechanics
Level
2
A small rock is thrown vertically upwards (take the initial direction of motion as positive). Of the following plots, the one which correctly represents the velocity of the rock as a function of time is
Plot D
Plot B
Plot E
Plot C
Plot A
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1 solution
as it mentioned , the rock has an initial velocity larger than zero so options ,A and D are excluded .
now g (earth acceleration) is
(1) anti-parallel to velocity direction .
(2) and it is almost constant ( near earth surface).
so the velocity must decrease due to (1) , in a linear way due to (2) , this leads us to the only valid model of the free fall representation which is option (C) .