passwella.
Menu

JAMB Physics 1978 Question 4

Question 4

Motion

A palm fruit dropped to the ground from the top of a tree 45 m tall. How long does it take to reach the ground? (g = 10 m s−2).

  1. A.9 s
  2. B.4.5 s
  3. C.6 s
  4. D.7.5 s
  5. E.3 s
Show the answer and explanation

Answer: E (3 s)

Explanation

Starting from rest, s = ½gt², so 45 = ½ × 10 × t², giving t² = 9 and t = 3 s.