An ocean wave is measured to have a period of 12 seconds and an amplitude of 40 cm above water level. You turn on a stopwatch as soon as a wave rolls in (t=0 at max height). What will be the water height 45 seconds later? O 40 cm above water level O 40 cm below water level O Water level O 20 cm above water level O 20 cm below water level

These aren't any of the choices

Earth's gravity pulls everything downward It pulls down each kilogram with a force of 9.8 Newtons. On a force table, a thread has a brass cylinder attached to it weighing 100 grams. If Earth's gravity pulls this weight (0.1 kg) downward with 0.98 N of force, how much weight is applied by Earth's gravity to the brass cylinder hanging on the thread?

Do fast, just answer.

A car with a mass of 1200 kg moves at 17 m/s. What force is needed to bring the car to a halt in 10 s?