Aristotle believed that everything on earth is made of one of only 4 types of material: earth, air, water, or fire.
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What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

John throws .4 kg ball with velocity of 18 m/s. hits .2 kg bottle and bottle flies 25 m/s. how fast is ball traveling after hitting the bottle?

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?