A stone is thrown downward at a velocity of 5 m/s from the top of a cliff 65 m above the ground below. How long will it take to hit the ground below?

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.

If the area of a square has increased by a factor of 16, by how much has each side increased?

What is an electric motor? explain its operation. 2-3 sentence