Answer: 90N
Explanation:
Mass of ball = 0.45 kg
Change in velocity = 20.0 m/s
Time = 0.10 seconds
Force required for change = ?
Since force refers to the change in momentum per unit time, hence
Force = Momentum / Time
i.e Force = Mass x (change in velocity / time)
Force = 0.45kg x (20.0m/s /0.10second)
= 0.45kg x (200 m/s^2)
= 90N
Thus, 90N of force was necessary for this change in velocity
