Claudia+S

14th February 2012

__**Relative Motion Q&A**__

160km h-1 east Velocity = 0km/h Metres travelled towards each other /s = 55.56m/s 55.5m/s h-1 south 17m/s h-1 north No. In order to overtake the car safely, you would have to travel 250m (over the 10s). By that time, the other car would have travelled 278m (nearest m). There would be a crash at abotu 9 seconds.
 * Question 1:** Two trucks are travelling towards each other on the freeway (see figure). The larger truck, C, is travelling east at 60 km h-1, and the smaller truck, D, is travelling west at 100 km h-1. What is the velocity of C relative to D?
 * Question2:** Consider two cars, X and Y, travelling towards each other at 27.78 m s-1. What is the velocity of X relative to Y? How many metres is each car travelling towards each other in a second.
 * Question 3:** Two cars pass each other, the first travelling 30.5 m s-1 north, the second at 25 ms-1 south. Find the velocity of the second car relative to the first.
 * Question 4:** What is the relative velocity of a fielder to a cricket ball if the ball is moving south at 12 ms-1 and the fielder north at 5 ms-1?
 * Question 5:** Imagine you are in a car that has to travel at 90 km h-1 to overtake a slower car. To do this will take you 10 seconds. However there is another car travelling towards you at 100 km h-1 at a distance of 500m. Can you overtake the slower car safely?