a car takes 1 hour to travel 100 km along a main road and the half hour to travel 20 km along a side road what is its average speed​

If forces acting on an object are unbalanced. true or false

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match

Determine the force the sun exerts on an object with a mass of 80.0 kg if that object is on the earth. what is the force exerted by the moon on the same object? what is the force the earth exerts on it?