Classical Mechanics
# 1D Kinematics

If an object is thrown straight upward with an initial speed of $8\text{ m/s}$ and takes $7$ seconds to hit the ground, from what height was the object thrown?

Assume that gravitational acceleration is $g=10\text{ m/s}^2.$

A race car is on a straight track. The race car accelerates from rest, covering $100~\mbox{m}$ in $5~\mbox{seconds}$. What is the acceleration of the race car in **$\mbox{m/s}^2$**?

**Details and assumptions**

- You may neglect air resistance.

A rock is dropped vertically off the edge of a cliff and hits the ground with an impact velocity of $90\text{ m/s}.$ How high is the cliff?

The gravitational acceleration is $g=10\text{ m/s}^2.$

Cliff diving is an extreme sport. If a cliff diver dives from a platform 50 meters above the water, how long does the dive take **in seconds**?

**Details and assumptions**

- The acceleration of gravity is $-9.8~\mbox{m/s}^2$.
- The diver can be treated as a point mass and has no vertical velocity at the start of the dive.
- Ignore air resistance.