JAMB - Physics (1988 - No. 5)
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.
4.50ms-1
11.25ms-1
20.00ms-1
45.00ms-1
Giải thích
F = \(\frac{m(v - u)}{T}\)
30 = \(\frac{0.075(v - 0)}{0.05}\)
v = 20ms-1
30 = \(\frac{0.075(v - 0)}{0.05}\)
v = 20ms-1