A bird moves from point (1, -2) to (4, 2). If the speed of the bird is 10 m/sec, then the velocity vector of the bird is

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5( i^−2j^ )

5(4i^+2j^)

0.6i^+0.8j^

6i^+8j^

answer is D.

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Detailed Solution

v=|v→|⋅r^=10⋅(3i^+4j^)|3i^+4j^|=10(3i^+4j^)5=6i^+8j^

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