Question:

Ahmed tossed a ball up along the y-axis
with initial speed 10 m/s.

(a) What is the acceleration of the ball at the highest point when the ball speed is zero?

(b) What is the ball maximum height?

(c) How long does the ball take to reach its maximum height?

(d) What is the displacement of ball when it comes back to Ahmed's hand?

Answer:

(a) a = -g = -9.8 m/s.

(b) Since the time is missing, Eq. (3), namely,

can be used to solve it. The final velocity is v = 0. Assume y_{0}
= 0. Eq. (3) leads to

(c) Using Eq. (1), namely,

v=v_{0}-gt,

(c) Displacement = 0 m.