Question

A ball rolling down an inclined plane travels, in successive seconds, k feet, 2.5k feet, 4k feet, etc… . Find the distance traveled by the ball

Answer 1

Answer: 7.5k

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We simply add up the three expressions

k+2.5k+4k = 1k+2.5k+4k = (1+2.5+4)k = 7.5k

Because we don't know the value of k, we leave it as is.