(9) What acceleration does it take to reach 15 m/s (from rest) in 5 seconds?

prolly a beacuse the momentuem the car has increases while going down hill

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.

prndulum needs thread, weight clock to time swings