Multiple choice general knowledge science & technology

A BODY IS THROWN FROM A 40 METER HIGH BUILDING TOWARDS GROUND AT A VELOCITY OF 10m/s.IF g = 10 m/s-s THEN FIND VELOCITY OF BALL WHEN IT STRIKES GROUND.

  1. 50 m/s

  2. 40 m/s

  3. 0 m/s

  4. 30 m/s
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Using the kinematic equation v² = u² + 2as, where initial velocity u = 10 m/s (downward), acceleration a = g = 10 m/s², and displacement s = 40 m. This gives v² = 100 + 2(10)(40) = 900, so v = 30 m/s. Options A and B incorrectly ignore initial velocity or miscalculate, while C is physically meaningless.

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