Problem 4: Consider a ball of mass m attached to a string of length L, which is being spun around in a horizontal circle as shown in the gure. This image is shown from 1' above, so gravity is acting into the page. .' "- _______ -\"l IIIL'L'\\|)L'r'l[:Lcnm How much work is the string doing on the ball, if it moves with a constant speed v? Expression W= Select from the variables below to write your expression. Note that all variables may not be required. a, limit a: d: gah,ja k, L, m,P5t,v Problem 5: A box of mass m is initially at rest at the top of an inclined plane, which has a height of 5.1 m and makes an angle of 0 : 22 with respect to the horizontal. After being released, it is observed to be traveling at v : I}. 65 m/s a distance d after the end of the inclined plane as shown. The coefficient of kinetic friction between the box and the plane is pp = 0.1, and the coefficient of friction on the horizontal surface is pr = 0.2. I Ihccqu-rltuxnm Part (a) What is the speed of the box, in meters per second, just after it leaves the inclined plane? Numeric : A numeric value is expected and not an expression. \"bottom = Part (b) Find the distance, d, in meters. Numeric : A numeric value is expected and not an expression. d