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# M1 Vector Help watch

1. A particle A starts at the point with position vector 12i+12j. The initial velocity of A is (−i+j)ms−1, and it has constant acceleration (2i−4j)ms−2. Another particle, B, has initial velocity ims−1 and constant acceleration 2jms−2. After 3 seconds the two particles collide. Find

a) the position vector of the point where the two particles collide

b) the position vector of B's starting point

Any explanation of the method?

2. (Original post by Gold Phoenix)
A particle A starts at the point with position vector 12i+12j. The initial velocity of A is (−i+j)ms−1, and it has constant acceleration (2i−4j)ms−2. Another particle, B, has initial velocity ims−1 and constant acceleration 2jms−2. After 3 seconds the two particles collide. Find

a) the position vector of the point where the two particles collide

b) the position vector of B's starting point

Any explanation of the method?

Hint:

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Updated: March 16, 2013
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