A ball of mass 2.0 kg is thrown vertically upward front the top of a building. The ball’s velocity v is given as a function of time t by the equation v(t)=R-St, where R=5 m/s and s=10 m/s^2. The positive direction is upward. What is the ball’s acceleration at time t= 1 s A. -10 m/s ^2
B. -5 m/s ^2
C. 0
D. 5 m/s^2
E. 10 m/s^2

ok

explanation:

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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the force represented by vector a is normal force. if the hockey puck is moving to the right, when it is hit with a significant force by the hockey stick the puck will move off in a different direction. correct on edge.