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Ymorist [56]
3 years ago
6

You're on a train that's moving forward at 50 mph. You throw a ball in the direction that the train is moving. Relative to you a

nd the train, the ball leaves your hand travelling at 20 mph.From the point of view of someone standing alongside the tracks, how fast is the ball moving?
Mathematics
1 answer:
dsp733 years ago
8 0

Answer:

Velocity =  70mph

Step-by-step explanation:

Given

Train = 50mph

Ball = 20mph

Required

How fast is the ball seem to be moving?

This question illustrates relative velocity;

Since the ball and the train moves in the same direction, the required velocity relative to the person standing behind is:

Velocity =  Train + Ball

i.e. we add both velocities

Velocity =  50mph + 20mph

Velocity =  70mph

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Let x% be the salt concentration of first solution.

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So, total amount of salt in new mixture = \frac{8x}{100} +\frac{517}{100} = \frac{8x+517}{100}

But given that this new solution is a 43% salt solution.

Hence amount of salt in new mixture of (8+11)=19ml solution of 43% salt solution is \frac{19*43}{100} = \frac{817}{100}

Hence \frac{8x+517}{100} = \frac{817}{100}

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          x= 300/8 = 37.5

Hence the salt concentration in the first solution is 37.5%

8 0
3 years ago
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2 years ago
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