Question

Help

Answer 1

initial kinetic energy = final potential energy

(1/2)mv^2 = mgh

solve for height

Answer 2

would v^2 be 28

Answer 3

v = 28

v^2 = 28^2

Answer 4

h=40 m/s

Answer 5

just m, but yes

Answer 6

for ii :the ball will not go as high?

Answer 7

for ii) air resistance will decrease the final height because some of that kinetic energy will be "spent" acting against air resistance

Answer 8

for f) (the battery powered car)

batteries are stored chemical energy, so

chemical energy --> electrical energy --> kinetic energy + heat energy as a waste product, maybe light and sound too

Answer 9

perfect thanks