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A train is travelling at 50m/s. How long does it take the train to reach 60m/s if it accelerates at a constant rate of 0.5m/s^2? How many kilometres does it travel in this time?

The initial velocity, u, is 50 ms -1 The final velocity, v, is 60 ms -1 The acceleration, a, is 0.5ms -2 The question is asking us to find the time, t. The equation of motion linking u, v, a, and t is v = u ...
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Answered by Elena S. • Physics tutor
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f(x)=x^2+12x+32=0, solve for x

Method 1: Quadratic formulaf(x)= ax 2 +bx+c, therefore a=1, b=12, c=32 - quadratic formula= (-b+/-(b 2 -4ac) 1/2 )/2ax=(-12+(144-128) 1/2 /2 = -4 or x=(-12-(144-128) 1/2 )/2 = -8 Method 2: FactoriseWe need t...
Answered by • Maths tutor
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Explain how evolution by natural selection brings about changes in a species ?

Variation is present in a population, this can either be genetic variation or due to mutations. A selectional pressure causes a stuggle for existance. Selectional pressures can come from a predator, disease ...
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Answered by Martina S. • Biology tutor
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How do I structure an essay?

To make it easier for you to keep hold of your ideas, you can summarise your points in your introduction. For example, if I was writing an essay about Christmas, I might say; 'In order to explain what Christ...
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How does adult cell cloning occur?

In adult cell cloning, an egg cell is taken from a donor animal - such as a sheep - and it is enucleated. This means that the nucleus which contains all of the genetic information of the sheep is removed fro...
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Answered by Shan H. • Biology tutor
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