1.

Gravitational field ia uniform, the gravitational PDface of a planet and point 100 m aboveKg. The work done in moving a mass50 J/5 kg from surface to a point 10 m above is1)5 J2) 25J3)2.5J4) 50 J

Answer»

The potential per unit mass is:

U/m = a·h

50 joule/kg = a·(100 m)

1/2 joule/kg-m = a

Work to lift a mass m to a height h is:

W = F·d = ma·h

m = 5 kg

a = 1/2 m/s2

h = 10 m

W = 25 J



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