When is evidence considered scientific?

While sitting motionless in a 5 kg friction free wagon, an 80kg clown catches a 15 kg cannonball traveling horizontally at 20 m/s. After the cannonball is caught, at what speed do the clown, wagon, and ball move?

Why are humans common ancestor of fish and reptiles

How long does it take a car to accelerate from 20 m/s to 40 m/s if it accelerates at 5 m/s2?

The molecules in which of the following have the greatest average molecular kinetic energy?

The ratio of red to blue marbles in a bag 3:2. If there are 18 red marbles. How many blue marbles are in the bag

A grocery shopper tosses a (n) 9.1 kg bag of rice into a stationary 19.3 kg grocery cart. The bag hits the cart with a horizontal speed of 6.6 m/s toward the front of the cart. What is the final speed of the cart and bag? Answer in units of m/s.

Where do most metamorphic rocks processes take place?

A 13,500 kg railroad freight car travels on a level track at a speed of 4.5 m/s. It collided and coupled with a 25,000 kg second car, initially at rest and with brakes released. What is the speed of the two cars after collision

What type of waves move energy forward, but the source makes up and down

Why do helium balloons float? Talk about density of atoms and compare to elements in the air.