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A mass of 40 kg of ice slides down a frictionless slope of 30°. At this...

A mass of 40 kg of ice slides down a frictionless slope of 30°. At this time, one person pushed the ice down at a constant speed by applying force parallel to the slope. While the ice is exercising a distance of 2 m along a slope,

1.how much work is done on ice by humans?
2.How much work is done by gravity?
3.How much work is done by normal force?

4.How much work is done by total force acting on ice?

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