An astronaut exploring another planet drops a 0.34-kg rock from a height of 1.7

Question

An astronaut exploring another planet drops a 0.34-kg rock from a height of 1.7 m above the planet's surface. Measurements determine that the rock loses 4.0 J of gravitational potential energy as it falls. What is the magnitude of the acceleration due to gravity on this planet?

a) 6.9 m/s2

b) 4.8 m/s2

c) 9.3 m/s2

d) 8.1 m/s2

e) 1.9 m/s2

2) A moving object is acted on by a non- conservative force, which does negative work on it over a 3 second interval. which statement is true about the objects motionduring 3 seconds?

a) The object must have lost KE

b) The object must have lost PE

c) the object must have lost both KE and PE

D) More information needed

Explanation / Answer

a) PE = mgh

4 = 0.34*g*1.7

So g = 6.92 m/s2

b) The object must have lost Kinetic energy as object is moving and work done is negative so force is acting in opposition to the direction of motion

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