A3600 kg truck is parked on a 14 ∘ slope. you may want to review (pages 141 - 145) . part a how big is the friction force on the truck? the coefficient of static friction between the tires and the road is 0.90. express your answer to two significant figures and include the appropriate units.

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?