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Question1

A dockworker applies a constant horizontal force of 76.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 13.0m in a time 5.30s

a. What is mass of the block of ice?

b. If worker stops pushing at the end of 5.30s, how far does block move in the next 5.80s?

Question2

The radius of Venus (from the center to just above the atmosphere) is 6050 km (6050103 m), and its mass is 4.91024 kg. An object is launched directly up from just above the atmosphere of Venus.

(a) What initial speed is necessary so that when the object is far from Venus its final speed is 7000 m/s?

(b) What initial speed is essential so that when the object is far from Venus its final speed is 0 m/s? (This is called the "escape speed.")

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