Find the initial velocity of a ball that has a final velocity of 17.9 m/s, west after it accelerated at 63.7 m/s2, west for 0.21 s

An unknown force pushes a 17 kilogram block across a smooth (frictionless) floor. three seconds after the force is first applied to the block, the block is moving with a speed of 6 meters per second. what is the magnitude of the unknown force?

Why do gases fill the container they are in, rather than staying in just one part of it

What remains the same in a compound regardless of the quantity?

The atomic number of an element is 75. is this element diamagnetic or paramagnetic?

An object having a mass of 2.0 kilograms falls from a height of 15 meters. What is its kinetic energy when it hits the ground?

12. What is the speed of a wave with a wavelength of 10 meters and a frequency of 100 Hz?

Air is enclosed in a syringe at room temperature. The end is the pushed so the air only fills a 1/3 of the length of the syringe. What happens to the: A) Number of particles B) Volume C) Density D) Pressure

What are some nonstandard ways that you can measure the length of a dog?

In a race, a car goes from 3 mph to 50 mph in a course of one hour. What's the acceleration?

John pushes his brother Danny on a skateboard. John applies a force of 150 N and Danny's acceleration is 1.2 m/s^2. what is the combined mass of danny and his skateboard