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Che. It's yur boi!
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ΔKE=1/2mvf^2- 1/2mv0^2 a)Plug numbers in 1. ΔKE=1/2(64.4)(8.56)^2- 1/2(64.4)(2.11)^2= -2216.05 (because displacement, I think) 2. -2216.05J+(-289J)-80J Answer =-2425.05J b.) 1. W=ΔKE, W=ΔPE(PE=mgh), ΔPE=ΔKE (64.4kg)(9.8m/s^2)h=2425.05J
