While a roofer is working on a roof that slants at42.0^\circ above the horizontal, he accidentally nudges his85.0 {\rm N} toolbox, causing it to start sliding downward,starting from rest.
If it starts 4.55 {\rm m} from the lower edge of the roof, how fast will thetoolbox be moving just as it reaches the edge of the roof if thekinetic friction force on it is 21.0 {\rm N}?


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