1) 20] a small ball is fastened to a long rubber band and twirled around in such a way that ball moves in an elliptical path given by the equation r(t) = bcos(at)i + 2b sin(at)j where b and are constants. find the velocity and acceleration vectors of the ball as a function of time. at what times does the distance r have its maximum value? what are the magnitudes of the velocity and acceleration at those times?

Choose each of the settings that follow and list them below do it ill mark brainliest first object= position= speed= acceleration= second object= position= speed= acceleration=

Abike rider starts from rest and accelerates 28.0 meters down a slope in 5.00 seconds. what is her acceleration? select one: a. 3.21 m/sec2 b. 1.75 m/sec2 c. 9.80 m/sec2 d. 2.24 m/sec2

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.