Aball is kicked from the ground with a speed of 25 m/s at an angle of 65 with respect to the horizontal. it will reach an elevation of 24 m at two separate times (once on the way up and once on the way down). what is the difference in these two times? a) 3.02 s b) 2.59 s c) 2.06 s d 1.71s e) 1.34 s 2. a 40 kg block is being pulled at a constant velocity across a horizontal surface by a 150 n force at an angle of 60° above the horizontal. what is the coefficient of kinetic friction between the block and the floor? c) 0.389 e) 0.286 a) 0.410 b) 0.378 d) 0.348 3. a spring pulls mass along a frictionless surface by exerting a force fx i on the mass. if k 400 n/m and m0.5 kg, then the work done by the spring in moving the block from x 0.1 m to x0 is a)2.00 j b) 8.00 j c)18.0 j d) 32.0 j e) 48.0 j 4. in the previous problem, if the mass starts from rest and the coefficient of friction between the mass and the surface is h0.7, what is the speed of the mass when it's at x0 m? a) 5.41 m/s b) 8.24 m/s c) 11.1 m/s d) 6.99 m/s e) 2.57 m/s 5. a pendulum consisting of a mass m0.2 kg attached to a massless rod of length l0.3 m is pulled to an angle e 15° and released. the speed of the mass at the bottom of the swing is a) 0.742 m/s b) 1.03 m/s c) 0.254 m/s d) 0.448 m/s e) 0.595 m/s