Answer:
J
Explanation:
The daughter moves with greater acceleration backwards because of her weight.
Answer:
hope you like it mark as brainliest
Explanation:
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.
The coefficient of friction (fr) is a number that is the ratio of the resistive force of friction (Fr) divided by the normal or perpendicular force (N) pushing the objects together. It is represented by the equation: fr = Fr/N.
Answer:
The mass of the rock is 
Explanation:
From the question we are told that
The length of the string is 
The angular velocity is 
The tension on the string is 
Generally the centripetal force acting on the rock is mathematically evaluated as

making m the subject of the formula

substituting values

