An object of mass m=5kg is being pulled up an inclined plane which is at 40° to the horizontal. The object is pulled at a constant speed of 0.8ms-1 by a force which acts parallel to the inclined plane.
The coefficient of friction between the object and the plane is 0.2
a)Draw a diagram showing the forces acting on the object.
b)Calculate the magnitude of the force of friction acting on the object.
c)Calculate the gain in gravitational potential energy when the object has moved 0.5m (measured parallel to the slope).
d)Calculate the total work done in pulling the block 0.5m (measured along the slope).​

Asilver dollar is dropped from the top of a building that is 1324 feet tall. use the position function below for free-falling objects. s(t) = −16t2 + v0t + s0 (a) determine the position and velocity functions for the coin. s(t) = v(t) = (b) determine the average velocity on the interval [1, 2]. ft/s (c) find the instantaneous velocities when t = 1 second and t = 2 seconds. v(1) = ft/s v(2) = ft/s (d) find the time required for the coin to reach the ground level. (round your answer to three decimal places.) t = s (e) find the velocity of the coin at impact. (round your answer to three decimal places.) ft/s