A ball of mass I .5 kg falls vertically downward. Just before striking the floor, its speed is 14 m/s. Just after rebounding upward, its speed is 10 m/s.
If this change of velocity took place in 0.20 seconds, what is the average force of the ball on the floor?
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Ответ:
180 N
Explanation:
We know that acceleration is the rate of change of speed per unit time hence
where v and t are velocity and time respectively, f and i represent final and initial.
Also, from Newton's law of motion, F=ma and replacing a with the above then
Substituting 1.5 Kg for mass, m -14 m/s for i and 10 m/s for for v then
Therefore, the force is 180 N
Ответ:
because life is a besh and it likes seeing us sad