How do you find average velocity from acceleration and time?

Explanation:

vav = s/t = vi + ½at. Acceleration x time equals the total change in velocity, or vf - vi.

Hope this helps. Couldn't find all my notes.

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answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg