Question

A book rolls horizontally off of a bookshelf of height 1.7m with a speed of 2 m/s. How long does it take the ball to reach the ground?

Answer 1

initial velocity is 0 in the y-direction making the third kinematics equation the easiest to use

height = delta y = (1/2)at^2

solve for time, a is acceleration due to gravity as usual (use positive g this time)

Answer 2

1.7 = delta y = (1/2)9.8t^2

Answer 3

good solve for t

Answer 4

C?

Answer 5

well done