sara1210 sara1210

16-02-2017
Mathematics

Answered

IT'S URGENT PLZZZZZZZZZ HELP SOMEONE HELP PLZZZZZZZZZZZZZZZ I NEED IT PLZZZZZZZZZZZZZZZZZZ!!!

IT S URGENT PLZZZZZZZZZ HELP SOMEONE HELP PLZZZZZZZZZZZZZZZ I NEED IT PLZZZZZZZZZZZZZZZZZZ!!! class=

Verified Answer :

paytonchernoff paytonchernoff

16-02-2017

At start:   PE only

At end: KE and energy lost to friction

PE = KE + E
E = PE - KE
    = mgh - (1/2)mv^2
    = (40)(9.8)(12) - (.5)(40)(10)^2
    = 2704J

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