physics work

Find KE, PE, W and P

a. for 10kg mass
   height of 20 m
   v = 0
   a= 0
   t=10s

KE = 1/2 mass x velocity squared = 5 x 0 = 0J
PE = mass x gravity  height = 10 x 9.8 x 20 = 1960 J
W = force x displacement = m x a x d = 10 x 0 x 20 = 0J
P = work/time = 0/10s = 0Watts

b. height 10
   v = 10
   a = 2
   t = 10
  d=10

KE = 1/2 mass x velocity squared = 1/2 x 10 x 10 = 500J
PE = mass x gravity x height = 10x 9.8 x 10 = 980 J
W = 10 x 2 x 10 = 200J
P = 200/10 = 20 watts