A11kg block slides up a 30° inclined plane at a constant velocity. the coefficient of friction between the block and the plane is μk=0.2. in order for the block to slide up the incline, someone must apply a force to the block. what is the magnitude of the applied force if it points horizontally?

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?