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CBSE Class 9 Answered

a man throws a ball with the same speed vertically upwards but after the other at an interval of 2 seconds what should be the speed of the true so that more than two balls iron sky tenida given g equals to 10 metre per second square
Asked by seshukumari.cheeda | 29 Jul, 2019, 12:44: PM
answered-by-expert Expert Answer
The initial velocity with which the two balls has to be thrown so that atleast two balls are in the sky is given by first equation of motion,
 
Thus, 
v = u + at 
v = 0 when the ball reaches the maximum height.
Thus, 
0 = u + gt 
g =10 m/s2
and time interval t = 2s 
Thus, 
u = -gt = -10 x 2 = 20 m/s 
Answered by Shiwani Sawant | 29 Jul, 2019, 04:38: PM

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