The Student Room Group
Reply 1
thanks for the reply,
the answer at the back of the book sais it is 20i-23j?
how did they come up with this number, please help
Reply 2
velocity = sqrt (3²+4²) = 5
Its moving direction 3i-4j at 10m/s . 10/5=2
velocity vector=2(3i-4j)=6i-8j

After 3 seconds position vector is
r=(2i+j)+3(6i-8j)
r=20i-3j
Reply 3
Malik
velocity = sqrt (3²+4²) = 5
Its moving direction 3i-4j at 10m/s . 10/5=2
velocity vector=2(3i-4j)=6i-8j

After 3 seconds position vector is
r=(2i+j)+3(6i-8j)
r=20i-3j


whats 10/5 for?

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