A dictionary is pulled to the right at constant velocity by 10N force acting 30 degrees upward above the horizontal. The coefficient of kinetic friction between the book and horizontal surface is 0.5. what is the weight of the book?

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Snowballs are thrown with a speed of13m/s from a roof 7.0m above the ground. Snowball A is thrown striaght downwards; snowball B is thrown in a direction 25 degree above the horizontal.When the snowballs land,is the speed of A greater than, or the same speed of B?Verify your answer by calculation of the landing speed of both snowballs.

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