Physicshard · Past Paper
Two trains 120m and 80m long are running in opposite directions with velocities 42 km/h and 30 km/h. The time they take to cross each other is:
A10 s
B15 s
C20 s
D25 s
✓ Correct Answer: A — 10 s
Relative velocity = 42 + 30 = 72 km/h = 20 m/s. Total distance = 120 + 80 = 200m. Time = 200 / 20 = 10s.
Share this question
More from Physics
- What is the standard frequency of AC supply in Nepal?
- The energy possessed by a compressed spring is:
- A generator produces a voltage of 240V and delivers a current of 50A. If the resistance of the transmission line is 0.5 Ohm, how much power is lost in the line?
- What is the relationship between density (d), mass (m) and volume (v)?
- What is the effect on upthrust if the density of the liquid increases?