It was hard becasue they caught colds and stuff
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Momentum = m V = (21) x (3 west) = 63 kg-m/sec west(Bold italics are vectors)
1380 kph west
A vehicle that is traveling at 94 km/hr travels west from 1:00 p.m. to 3:30 p.m. That's 2 and 1/2 hours of travel time at 94 km/hr. The car will travel 94 km/hr times 2 1/2 hr or 235 km in the time specified. That means the car will be that much farther west than it was at the start, which was 17 km west of a school. Add the distance from the school to the starting point of the vehicle and you'll know where the car will be at the end of the observation period. 235 km + 17 km = 252 km west of the school.
Another car would have to travel at 70 km/hr west.To have the same velocity, it must have the same speed toward the same direction.
it is a sytem of writing in west Asia