An engine is used to pull a train of two cars out of a mine. The floor slopes upward at an angle of 30°. Each car has a mass of 10^4 Kg and normally travels without friction on the tracks. The engine can exert a maximum force of 1.5x10^5 N on car A. If the engineer again throttles back so that the force exerted by the engine on car A decreases at the constant rate of 3 N per second, how long before the train stoprs moving up the track? Assume the original speed was 3 m/s

the focus of lesson 1 is newton's first law of motion - sometimes referred to as the law of inertia. newton's first law of motion is often stated as. an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

explanation:

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.