A girl at an airport rolls a ball north on a moving walkway that moves east. If the ball’s speed with respect to the walkway is 0.15 m/s and the walkway moves at a speed of 1.50 m/s, what is the velocity of the ball relative to the ground?
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The ball's direction relative to the ground will be north of east.
All you do is sketch a right angled triangle, the side going north mark as 0.15.
The base, running east, you mark as 1.5.
Now all you need do is use Pythagoras' theorem to find the length of the hypotenuse.
0.15^2 + 1.5^2 = 2.2725.
Sqrt 2.2725 = 1.507.
The velocity of the ball relative to the ground is 1.507 m/sec.
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