In the presence of air resistance, a watermelon is launched into the air with 100 j of kinetic energy.
Its kinetic energy is less than 100 J when it reaches its starting point. Its kinetic energy decreases as it encounters air resistance and returns to its starting point. In actuality, some of the energy has been lost because of air resistance. Since we use the ball's original height as a point of reference, there is no potential energy when the ball is in its initial state of motion, and K is its kinetic energy. This total energy is conserved if there is no air resistance, therefore when the ball returns to its starting position, its kinetic energy will remain at 100.
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Just divide the two numbers
The constant force required is 17.6 N
<u>Explanation:</u>
Given-
Mass, m = 0.55 kg
Initial speed, u = 0
Final speed, v = 8 m/s
Time, t = 0.25 s
Force, F = ?
We know,
Force = mass X acceleration
F = 0.55 X
F = 0.55 X
F = 17.6 N
Therefore, the constant force required is 17.6 N
Pressure decreases with increasing altitude. The pressure at any level in the atmosphere may be interpreted as the total weight of the air above a unit area at any elevation. At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels.