APFIVE One-Dimensional Relative Velocity
Train A moves east at a constant speed of 25 m/s, while Train B moves west at a constant speed of 20 m/s on parallel tracks. A passenger on Train A throws a ball with a speed of 15 m/s relative to the train, in the same direction as the train’s motion. What is the speed of the ball as measured by an observer on Train B?
A
10 m/s
B
40 m/s
C
60 m/s
D
45 m/s
Question Leaderboard
| Rank | |||||
|---|---|---|---|---|---|
| #1 | nmtnice2010 | 2 | 2 | 0m 00s | 200 |
| #2 | uatendo228 | 2 | 2 | 0m 40s | 160 |
| #3 | nuralishardan | 2 | 2 | 0m 51s | 149 |
| #4 | carolinepoole.school | 2 | 5 | 1m 08s | 102 |
| #5 | alisamedli2009 | 1 | 1 | 0m 00s | 100 |
| #6 | jchenlisg | 1 | 1 | 0m 00s | 100 |
| #7 | kabraprachi23 | 1 | 1 | 0m 00s | 100 |
| #8 | kma4910 | 1 | 1 | 0m 00s | 100 |
| #9 | chuckp.0920 | 1 | 1 | 0m 00s | 100 |
| #10 | hyeokjinlee0924 | 1 | 1 | 0m 06s | 94 |
Items per page:
10
1 – 10 of 48