WAEC - Physics (2010 - No. 7)
Two cars X and Y travelling in opposite directions along the same high way at uniform velocities 110 kmh-1 and 90kmh-1 respectively pass each other at a certain point. The velocity of X relative to Y at the time they pass each other is
200 kmh-1
100 kmh-1
40 kmh-1
20 kmh-1
Giải thích
R = 110 + 90 = 200