What is happening to particles of matter while a change of state is taking
place?
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A. They are slowing down.
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B. They are multiplying in number.
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C. They are staying at the same speed.
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D. They are speeding up.

the answer is b ) square root of 5

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

not too sure thinking all accelerations are pointed down