1. The problem statement, all variables and given/known data A mass m = 2 is in free fall. The acceleration of gravity is g = 10. All numbers are in mks units. The position y(t) and velocity v(t) of the mass as a function of time t are y(t)=9−5t2 and v(t)=−10t. Find each of the energies (K,U,E) as a function of time t. Hint: substitute v(t) into K(v), substitute y(t) into U(y). 2. Relevant equations k = 1/2mv2 u = mgy 3. The attempt at a solution I know that: Work = ΔK -ΔU = ΔK im having trouble switching the equation to a function of time. Am i trying to approach the problem in the wrong way? any help is appreciated. Thanks!