Question

The effective length and time period of a second's pendulum are respectively equal toA train takes 2 hours to reach station B from station A, and then 3hours to return from station B to station A. The distance between the two stations is 200 kilometre. (i). The total distance travelled, (ii). The average speed and (iii). Average velocity of the train respectively are:

200km, 70km/hr, zero
400km, 80km/hr, zero
600km, 90km/hr, zero
800km, 100km/hr, zero​

Answer 1

Answer:

$Total distance   D=200+200=400 km</p><p></p><p>Average speed    ∣Vavg∣=Total timeTotal distance</p><p></p><p>∴ ∣Vavg∣=2+3400=80 km/h</p><p></p><p>Displacement   S=0</p><p></p><p>Average velocity  Vavg=Total timeTotal displacement</p><p></p><p>∴ Vavg=2+30=0 km/h</p><p></p><p>$