Solving a problem in physics section 46 point 92 mecha

92. Wagon weight m = 1 m down the cable railway with a gradient of α = 15 ° to the horizon. Assuming the friction coefficient f = 0,05, determine the tensile force of the rope when braking the car in the end of the descent, if the speed of the car before braking υ0 = 2,5 m / s, and the deceleration time t = 6 s.