atoms are unstable unless they have a similar number of protons and neutrons. To make the carbon atom stable, add 6 neutrons to
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Answer:
Explanation:
Given:
- x = initial vertical height of the ball = 20 m
- y = final height of the ball = 0 m
- a = acceleration of the ball in air =
- u = initial vertical velocity of the ball = 37.9 m/s
Assume:
- t = time interval
When an object is in air, the gravitational force due to earth in the downward direction and air resistance opposite to the motion of the object acts on it. But, air resistance is neglected unless it is mentioned in the question. This means only gravitational force due to the earth acts on it in the downward direction.
Let us first find out the time interval for which the ball remains in the air i.e., the time instant from which the ball was projected vertically up to the time instant at which the ball strikes the ground.
Since the ball in the air remains at constant acceleration motion, we have the following relation:
On solving the above quadratic equation, we have
t = -0.50 s or t = 8.23 s
Since t = -0.50 s is the time in the past. So, it is wrong and t = 8.23 s is the desirable time instant.
This means the ball is in the air for 8.23 s. Since the ball in the air remains in constant acceleration motion in the downward direction. So, the ball has a constant acceleration closest to at t = 6.2 s. This is because the ball remains in the air for 8.23 s.