9) Sela walks 50 meters South(A), then another 35 meters in a direction 45 degrees south of east. A- What are Ax and Ay? Ax =0 Ay =50 B- What are Bx and By? Bx = By = C- What is Rx? mot & oloo D- What is Ry? E-What is R? F-What is the angle of R?

Why would a 1kg(2.2lb) rock and a 20 kg rock have the same acceleration when dropped? Use Newton’s Second Law in your explanation. Hints: a. The force causing the acceleration is the weight of the rock which equals its mass in kilogram X 9.8 m/s2.  b. a=f/m   How much more force would you have to apply to a 30 kg block of cement compared to a 10 kg block of cement in order to achieve the same acceleration? Hint: Apply Newton’s Second Law.   Give a detailed explanation for both.

6. If a vehicle takes 8 seconds to increase speed from 20 miles/hour to 100 miles / Hour, what is its acceleration? (Hint: time has to be in basic units.)

You go through a loop in a roller coaster at constant speed. Your acceleration is: A. zero B. straight down C. toward the center D. straight up

8. A stone is dropped from a 1000 foot cliff. How long does it take to hit the ground? (Use acceleration a(t) = -32 feet per second squared).

Tectonic plates are large segments of the Earth's crust that move slowly. Suppose that one such plate has an average speed of 3.21 cm/year. Hint a. What distance does it move in 1.71 s at this speed in nanometers? It moves a distance of nm. b. What is its speed in kilometers per million years? Its speed is km/million years.

Do fast, just answer.