# Stuck on M1 Vector Question??Watch

#1

"A particle starts from the point with position vector 4j m and moves with constant velocity (2i-j) ms^-1. At the same time a second particle starts from the point with position vector (6i+8j) m and moves with constant velocity (-i-3j) ms^-1. Show that the particles collide, and find the time at which they do so."

I feel like I need to make some simultaneous equations to find t, and I've drawn a diagram, but apart from that I'm not getting anywhere...
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1 year ago
#2
(Original post by Hanako13)

"A particle starts from the point with position vector 4j m and moves with constant velocity (2i-j) ms^-1. At the same time a second particle starts from the point with position vector (6i+8j) m and moves with constant velocity (-i-3j) ms^-1. Show that the particles collide, and find the time at which they do so."

I feel like I need to make some simultaneous equations to find t, and I've drawn a diagram, but apart from that I'm not getting anywhere...
OK - hint - how far will the first particle go in t seconds? Then it's postition vector will be 4j plus this.

Post what you get
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#3
(Original post by Muttley79)
OK - hint - how far will the first particle go in t seconds? Then it's postition vector will be 4j plus this.

Post what you get
Ah okay! I didn't realise I had to add 4j and 6i+8j due to the starting positions and use the velocities. I've managed to get to the answer now, thank you for the help!
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