A football is thrown vertically upwards and reaches its maximum height after 4.50 seconds. a. What is the acceleration of the football at its maximum height? [1]
b. What is the initial velocity of the football? [2]

c. What is the maximum height reached by the football? [2]

d. Use the graph paper at right to sketch a qualitative velocity-time
graph for the motion of the ball as it comes up AND back down.
You do not need to fill in numbers, but you may if it helps. [1]

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

anchor = archer //

see earlier answer

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.