You are riding your motorcycle one day down a wet street that slopes downward at

Question

You are riding your motorcycle one day down a wet street that slopes downward at an angle of 20 below the horizontal. As you start to ride down the hill, you notice a construction crew has dug a deep hole in the street at the bottom of the hill. A Siberian tiger, escaped from the City Zoo, has taken up residence in the hole. You apply the brakes and lock your wheels at the top of the hill, where you are moving with a speed of 20 m/s. The inclined street in front of you is 40 m long. What must your initial speed be if you are to stop just before reaching the hole?

Explanation / Answer

This question is either wrong or incomplete. You are asking for intital speed but there is already one initial speed is given 20 m/s.

Cofficient of friction is required

So consitering cofficient of kinetic friction 0.25

V2 = 2*a*s

a = gsin20 - 0.25*gcos20 = 1.05 m/s2

so v =sqrt(2*1.05*40) = 9.165 m/s Answer

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