Your physics class decides to perform an experiment on circular waves. First, you make sure the water in the school swimming pool is level; that is, there are no waves. Next, a volunteer tosses a small marble near the center of the pool. Your teacher tells you the radius (in feet) of the outer ripple is given by r (t) = 0.73t, where t is the time in seconds after the marble hits the water given. The area of the circle is given by the function A(r) = π r2, where A(r) is the area in square feet and r is the radius in feet.

constant acceleration- a

constant velocity- c

no velocity or acceleration- b

explanation:

for body moving with a constant acceleration, the rate of change of displacement changes over time. this is proven by the increasing gradient of the curve (a) against time.

a body that is moving at constant velocity covers equal distances over equal periods of time, thus the straight line with a constant gradient c.

a stationary body   covers no displacement as time elapses. thus the flat line with   zero gradient.

22 dimes and 9 nickels

step-by-step explanation: