A ball is thrown vertically upward, which is the positive direction. A little later it returns to its point of release. The ball is in the air for a total time of 13.2 s. What is its initial velocity? Neglect air resistance.

since total time given in the question = 13.20 s
so 2 u/g =13.2
u =(13.2*g)/ 2
= (13.2 *9.8) /2
= 64.68 m/s
A ball is thrown vertically upward, which is the positive direction. A little later it returns...
A ball is thrown vertically upward, which is the positive direction. A little later it returns to its point of release. The ball is in the air for a total time of 7.5 s. What is its initial velocity? Neglect air resistance. (Indicate the direction with the sign of your answer.)
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