1) Classic rollercoasters are appropriately named because the cars do not have any engines or propulsion and coast along the track after they are pulled to the top of the first large
hill (Point A) by large chains connected to motors on the ground which gives them stored,
gravitational potential energy. Picture the first hill of 140 meters high with a steep drop
below all the way to ground level. Ignoring friction between the all the car wheels and the
track, as well as air resistance (drag), what would the velocity of the cars be at the bottom
of the hill (Point X).
B
140 m
A
- 120 m
95 m
с
80 m
D
х

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

What determines the amount of inertia an object has

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.