class 11-kinematics-motion in a straight line-motion under gravity
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v=0, a = -32ft/s^2, s= 9ft
v^2-u^2=2as
0-u^2=2x-32x9
therefore u = 24ft/s
v=u+at
0=24-32xt, therefore t = 3/4 sec
so the ball returns to the juggler after 3/4 sec
To maintain proper distance, the balls must be thrown at an interval of 3/5/2=3/8sec
Therefore the distance between the balls is
s = ut+[1/2]at^2
s = 24x[3/8] - [1/2]x32x[9/64] = 6.75ft
Hence d is the correct option
v^2-u^2=2as
0-u^2=2x-32x9
therefore u = 24ft/s
v=u+at
0=24-32xt, therefore t = 3/4 sec
so the ball returns to the juggler after 3/4 sec
To maintain proper distance, the balls must be thrown at an interval of 3/5/2=3/8sec
Therefore the distance between the balls is
s = ut+[1/2]at^2
s = 24x[3/8] - [1/2]x32x[9/64] = 6.75ft
Hence d is the correct option
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