Forces can be added together only if they are

Aacting on the same object.

Bbalanced forces.

Cunaffected by gravity.

Dsubstantial.

According to Newton’s third law of motion, when a hammer strikes and exerts force on a nail, the nail

Acreates a friction with the hammer.

Bdisappears into the wood.

Cexerts an equal and opposite force on the hammer.

Dmoves at a constant speed.

Answer each one