Answer:
B. F = 7.35 N
C. Equal and opposite
Explanation:
Given
The mass of the football, m = 0.42 Kg
Time of flight of the ball, t = 1.6 s
The initial velocity of the ball, u = 0
The final velocity of ball, v = 28 m/s
The acceleration of the ball is given by the formula
a = (v - u) /t m/s²
Substituting the values in the above equation
a = (28 - 0) / 1.6
= 17.5 m/s²
The force on the ball is given by the formula
F = m x a newton
Substituting the values in the above equation for force
F = 0.42 Kg x 17.5 m/s²
= 7.35 N
Therefore the force acting on the ball is, F = 7.35 N
According to newton's third law of motion, if a person exerts a force on a ball, the ball also exerts a force that is equal to applied force on the person's foot. It is in a direction opposite to the force exerted by the kicker's foot.
Hence, the forces are equal and acting in opposite direction.
