The force of gravity on the Moon is different from the force of gravity on Earth. This means that an object has different weight
1 answer:
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Suppose that Carol has x 10p coins in her purse. Since she has three times as many 20p coins as 10p coins, then she has 3x 20p coins in her purse.
x coins of 10p value $0.10x and 3x coins of 20p value $0.60x.
In total this amount of money is $(0.10x+0.60x)=$0.70x that is exactly $4.20. Thus, you get the equation
0.70x=4.20.
Solve it:
Carol has 6 coins of 10p and 3·6=18 coins of 20p.
Answer:
5 km/h
Step-by-step explanation:
In this problem, Lashonda swam 4 km against the current. So the distance covered in this case is
Calling the velocity of Lahonda without the current, and
the velocity of the current, in this situation Lahonda's velocity is
So we can write:
where is the time taken to cover the distance.
When Lashonda swims with the current, her velocity is
So we can write
where
is the distance covered in this case, and
the time taken.
The velocity of the current is
Since Lashonad takes the same time to cover the two distances,
So we can write
And solving for v, we find Lashonda's velocity without the current: