Standing on a balcony, you throw your keys to a friend standing on the ground below. one second after you release the keys, they have an instantaneous velocity of 13.9m/s, directed 45 below the horizontal. what initial velocity did you give them?
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Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.