Which object is in static equilibrium? a) a rolling ball that has a net force acting on it b) a cruising car that has no net force acting on it c) a book that has no net force acting on it and is sitting on a table d) a vase that has a net force acting on it and is sitting on a shelf

C) a book that has no net force acting on it and is sitting on a table

Explanation:

Equilibrium means the situation in which net force on a system is zero and hence the acceleration must be zero

this equilibrium is of two types

(1) Static equilibrium

Here object has net force zero and it remains at rest position

(2) Dynamic equilibrium

Here object has net force zero and object is moving at constant velocity

So here for static equilibrium condition we need to find the situation when net force is zero as well as the object must be a rest, so correct answer will be given as

C) a book that has no net force acting on it and is sitting on a table

the force represented by vector a is normal force. if the hockey puck is moving to the right, when it is hit with a significant force by the hockey stick the puck will move off in a different direction. correct on edge.