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A kick that lasts 0.03s sends a ball of mass 0.65kg with a velocity of 15m/s northwards. Find: a) The change in momentum of the...

      

A kick that lasts 0.03s sends a ball of mass 0.65kg with a velocity of 15m/s northwards. Find:
a) The change in momentum of the ball.
b)the average force exerted on the ball.
c) The displacement of the ball in 2 seconds

  

Answers


Moraa
a) The change in momentum of the ball.
Note that the ball is initially at rest, i.e. u=0m/s.
?P=mv-mu=(0.65*15)-(0.65*0)=9.75kgm/s
b) The average force exerted on the ball.
F=m(v-u)/t =(9.75kgm/s)/0.03s)=325N
c) The displacement of the ball in 2 seconds.
The upward acceleration of the ball is negative 2m/s5.

Moraa orina answered the question on April 8, 2018 at 17:35


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