newton's second law: Force is iqual to mass by aceleration F=M*A
The acceleration is directly proportional to force and inversely proportional to mass. this means that is an object is pushed, the stronger they push, the faster it will move, in the present situation Carmen is pushing the cart to move her boxes. the verb push is the action of force that carmen applied to the cart, the cart and the boxes are the mass and the verb move is the effect of the force acceleration.
She uses Kinetic Energy
The answer to this question is A. Contact.
As there is contact between her hands and the box. So we can say that it is an example of contact force.
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