Question
Sat September 08, 2012 By:

prove that if a body is thrown vertically upwards the time of ascent is equal to the time of descent

Expert Reply
Sat September 08, 2012
let the velocity at the time of throwing be U
thus the time for the velocity to become 0 at the highest point of flight.
Thus by first equation of motion thus t1 = U/g
Height attained, H = U2/2g          uisng the second equation of motion
Now at the time the time of descent,
time taken for the ball to come down will be:
t22 = 2H/g            using the third equation of motion
thus t2 = (U/g)2
 
clearly t1 = t2
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