Physicsmedium · Past Paper
A car travels from A to B at 20 km/h and from B to A at 30 km/h. The average speed for the whole journey is:
A25 km/h
B24 km/h
C50 km/h
D10 km/h
✓ Correct Answer: B — 24 km/h
Avg speed = (2 * 20 * 30) / (20 + 30) = 1200 / 50 = 24 km/h.
Share this question
More from Physics
- A man of 60 kg climbs up 20 m. If he takes 10 seconds, what is his power? (g = 10 m/s^2)
- The potential difference across a 10 Ohm resistor is 50 V. How many electrons pass through the resistor in 2 seconds?
- Which of the following materials is the best absorber of sound?
- The area under a velocity-time graph represents:
- If a body moves with constant velocity, its acceleration is: