Question

A 20kg log lifted 2m into air

Answer 1

Answer:

10m/s

Explanation:

v=20/2=10m/a

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Answer 2

M = 20 kg

M = 20 kgh = 1 m

M = 20 kgh = 1 mWork done against gravitational force,

M = 20 kgh = 1 mWork done against gravitational force,W = mgh

M = 20 kgh = 1 mWork done against gravitational force,W = mgh = 20 x 9.8 x 1

M = 20 kgh = 1 mWork done against gravitational force,W = mgh = 20 x 9.8 x 1 = 196 J