Aset of keys slides along the floor, coming to rest 1.4 meters from where it started. if the initial speed of the keys was 2.1m/s , then the acceleration of the keys is ?
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Ответ:
(2.1)^2+2a(1.4)=0
Solving for a I get -1.575m/s^2.
Ответ:
option b
Explanation:
because the law of conservation
it means that energy can never created nor be destroyed
even it will change into another form if energy