Physicsmedium · Past Paper
A ball is dropped from a building and reaches the ground in 3s. What is the height of the building? (g = 10 m/s^2)
A15 m
B30 m
C45 m
D90 m
✓ Correct Answer: C — 45 m
h = ut + 0.5gt^2 = 0 + 0.5 * 10 * 3^2 = 5 * 9 = 45m.
Share this question
More from Physics
- Which of these devices converts mechanical energy into electrical energy?
- Average speed is calculated as:
- A person who can see nearby objects clearly but cannot see distant objects is suffering from:
- If the mass of a planet is 4 times Earth and its radius is 2 times Earth, 'g' on that planet is:
- The displacement of a particle is given by x = (t - 2)^2. When will the velocity be zero?