Resistance is a force that
a. speeds objects up
b. slows objects down
c. changes an object's inertia
d. does not relate to object's motion user: staying upright during vigorous physical activity is best described as having good
a. balance
b. flexibility
c. agility
d. reaction time

1. option (b)

2. option (a)

Explanation:

1. Resistance is the force which tries to slow down the speed of moving body.

For example, if a ball is kicked, then after some time the speed of the ball goes on decreasing and then finally comes to rest. it is due to the resistance force of floor and the surface of ball.

2. It is called balance.

Staying upright due to some vigorous activities is due to the balance of the body.

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.