A 3.0 kg ball is lifted two meters upward in two seconds, and a 6.0 kg ball is lifted one meter upward in one second? Which requires more work? Which uses more power?

1. They both uses same energy

2. The 6 kg ball requires more power than 3kg ball

Explanation:

Sample 1

m = 3kg

g = 10m/s^2

h = 2m

t = 2secs

W = mgh = 3 x 10 x 2 = 60J

P = w/t = 60/2 = 30watts

Sample 2

m = 6kg

g = 10m/s^2

h = 1m

t = 1sec

W = mgh = 6 x 10 x 1 = 60J

P = w/t = 60/1 = 60watts

They both uses same energy but different power. The 6 kg ball requires more power than 3kg ball