A person driving a car at 180km/h sees a fallen tree on the road. He brakes immediately upon seeing the obstacle and manged to stop the car in 5 seconds. What was the acceleration of the car assuming it to be uniform? ​

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

What is the increase in density of a medium due to wave travel?

Suppose you plot the distance traveled by an object at various times and you discover that the graph is not a straight line. what does this indicate about the object's acceleration?