4 metres per second?
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No, you cannot because kilometers are a unit of distance and grams are a unit of weight.
There are 1000000 micrograms in one gram. Therefore, 2 grams is equal to 2 x 1000000 = 2000000 micrograms.
The British 2 Pence coin weighs 7.12 grams, so 100 of them would weigh 712 grams.
The mass of a penny is approximately 2.5 grams. To make 5 grams, you would need 2 pennies, as 2.5 grams x 2 = 5 grams.
You need to convert the 2 kg to grams, then divide the equivalent in grams by 50 grams.