You have to push a heavy box across three surfaces: a grassy field , ice rink, and a concrete playground. Which surface will be easiest to push the box across and WHY ?

Aparticle travels in a circular orbit of radius 21 m. its speed is changing at a rate of 23.1 m/s2 at an instant when its speed is 37.2 m/s. what is the magnitude of the acceleration (in m/s? ) of the particle?

Tall pacific coast redwood trees can reach heights of about 100 m. if air drag is negligibly small, how fast is a sequola cone moving when it reaches the ground f it dropped from the top of a 100 m tree?

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?