3 years ago

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

1 answer:

4 0

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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