What is force accelerating a coaster heading down hill

A brick is dropped from 100m up. Find it's impact velocity and air time.

A sample of a radioactive substance is reduced to 1.0 gram after 4 half-lives. Determine the mass of the original sample before it decayed. A 1/16 grams B 16 grams C 8 grams D 1/8 grams

Two grocery carts have the same initial total momentum. The two carts collide, and now cart B has a greater final velocity.

The goose has a mass of 20.5 lblb (pounds) and is flying at 7.80 miles/hmiles/h (miles per hour). What is the kinetic energy of the goose in joules?

What is the average power output of an athlete who can life 9.0 * 10^2 kg 2.5 m in 2.0 s?

In what way would a digital thermometer be preferable to those from a liquid-based thermometer? Digital thermometer readings are easier to use when performing calculations.

Why does the core of the sun contain more helium and less hydrogen than the surface of the sun?

What happens to a light ray passing through the center of a lens?

A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.870 m/s at an angle of 35.0° above the table, and it lands on the magazine 0.0770s after leaving the table. Ignore air resistance.

A force of 5 N accelerates an object. The object's mass is 50 g. What is the acceleration of the object? (Formula: F=ma)