Plutonium= Pu, 94, 244,94,94
Chromium= Cr, 24,52, 24,24
Neon = Ne, 10,20,10,10
Gold= Au, 79,197,79,79
Radon = Ra ,86,222,86,86
Below are the answers:
(a) Ep = mass x gravitational acceleration x height
<span>= 2kg x 9.8ms-2 x 3m </span>
<span>= 58.8J </span>
<span>(b) F = mg </span>
<span>= 2kg x 9.8ms-2 </span>
<span>= 19.6N </span>
<span>W = Fd </span>
<span>= 19.6N x 3m </span>
<span>= 58.8J
</span>
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