Answer:
Centripetal acceleration is 47 m/s²
Explanation:
It is given that,
Radius of the circle, r = 1.8 meters
The velocity of the ball, v = 9.2 m/s
We have to find the centripetal force of a ball on a string that is whirled horizontally over a boy’s head. It is given by :
[tex]a_c=\dfrac{v^2}{r}[/tex]
[tex]a_c=\dfrac{(9.2)^2}{1.8}[/tex]
[tex]a_c=47.02\ m/s^2[/tex]
or
[tex]a_c=47\ m/s^2[/tex]
So, the centripetal acceleration of the ball on a string is 47 m/s². Hence, the correct option is (E).
