Unilorin Post-UTME Physics 2024 (Model questions) Question 1

Question 1

Motion

A stone is thrown vertically upward with a speed of 30m/s. Neglecting air resistance, how long will it stay in the air before returning to the thrower's hand?

A.30s
B.15s
C.3s
D.6s

Show the answer and explanation

Answer: D (6s)

Explanation

Time to the top: t = u/g = 30/10 = 3 s. Coming down takes the same time, so it is in the air for 3 + 3 = 6 s.