A skater (50kg) is drifting along at 3.0m/s when his friend pushes him with a 50 N force until his speed increases to 7.5 m/s. For how long did his friend push for?

what are the options.

explanation:

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2