Answer:
The ball will have a kinetic energy of 0.615 Joules.
Explanation:
Use the kinetic energy formula

The kinetic energy at the moment of leaving the hand will be 0.615 Joules. (From there on, as it ball is traveling upwards, this energy will be gradually traded off with potential energy until the ball's velocity becomes zero at the apex of the flight)
(C)
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I think it’s the third one, if not it’s the first.
Answer:
Torque, 
Explanation:
Given that,
Coordinates, 
Force acting on the flea, 
Let
is the net torque about the origin on a flea. It is given by the following formula :




So, the net torque about the origin on a flea is
. Hence, this is the required solution.