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Sagot :
Answer:
15.10m/s
Explanation:
The mass of the ball(m)=400g = 0.4kg
The radius of the string is(r)=15m
The tension in the string is(T)=10N
The acceleration due to gravity = [tex]9.8m/s^{2}[/tex]
The tension in the string when the body is at the bottom is given by
[tex]T=\frac{mv^{2} }{r}+mg[/tex]
To find the speed of the ball, we make v the subject of the formula
Therefore, [tex]v=\sqrt\frac{r(T-mg}{m}[/tex]
[tex]v= \sqrt\frac{15(10-0.4*9.8)}{0.4}[/tex]
[tex]v=\sqrt\frac{91.2}{0.4} \\[/tex]
[tex]v=\sqrt228 = 15.10 m/s[/tex]
The speed of the ball = 15.10m/s
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