When taking a penalty kick, a footballer applies a force of 30.0N for a period of 0.05s. if the mass of the ball is 0.075kg, calculate the speed with which the ball moves off.
-
A.
4.50ms-1 -
B.
11.25ms-1 -
C.
20.00ms-1 -
D.
45.00ms-1
Correct Answer: Option C
Explanation
F = (frac{m(v – u)}{T})
30 = (frac{0.75(v – 0)}{0.05})
v = 20ms-1