Answer:
B
Explanation:
because atoms make up an element.
A)acceleration is in the direction of motion
E=mgh. 196=5kg*9.81m/s^2*h. So h=196/(5*9.81)=4m
First we need to convert the angular speed from rpm to rad/s. Keeping in mind that


the angular speed is

And so now we can calculate the tangential speed of the child, which is the angular speed times the distance of the child from the center of the motion: