a ball is projected vertically. after 3s from projection it's velocity becomes 1.25 times of the velocity of projection its velocity of projection is
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Since the velocity has increased after upward projection, it is clear that the ball is on its way towards the ground and that gravity has added up to that velocity. Therefore, by the sign conventions, the final velocity is negative; so is the acceleration due to gravity. The initial velocity, on the other hand, is positive.
Thus, I substitute the values to the equation "v = u +- at"
v = u - gt
-1.25u = u - gt
gt = 2.25u
u = 30/2.25
= 3000/225
= 13.33 units/sec
Thus, I substitute the values to the equation "v = u +- at"
v = u - gt
-1.25u = u - gt
gt = 2.25u
u = 30/2.25
= 3000/225
= 13.33 units/sec
sumitsk1:
wrong
why do ya think its wrong?
its answer is 40m/s
;_;
I have given reasons for my answer... check it out... and let me know if something's insane out here!
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