1. A car is able to provide 300kW of tractive power, as it accelerates from 36 to 288km/hr, along a flat and level section of road. This is achieved in 2 seconds. a) Calculate the tractive force at 36km/hr.

2. An 8.00 kg package in a mail-sorting room slides 2.00 m down a chute that is inclined at 53.0° below the horizontal. The coefficient of kinetic friction between the package and the chute's surface is 0.40. a) Calculate the net work done on the package by summing the work done on the package by friction, gravity and the normal force. b) If the package has speed of 1.2 m/s at the top of the chute, what is its speed at the bottom?

Marge pulls Vinnie on a sled along a friction free surface. The combined mass of Vinnie plus sled is 18.5kg producing an acceleration of 0.6m/s^2. The rope on the sled makes a 35 degree angle with the ground below. a. How much work does Marge do while pulling the sled for 20m? b. How far could Marge pull the sled to expend 4001

A mover lowers a piano weighing 200.0 kg using the pulley system in the diagram below. Assume that the piano is initially 2 m from the ground. a) How much work does the mover have to do to slow down the piano's descent if it reaches a speed of 0.25 m/s at 1 m from the ground? b) Assuming that the mover exerts a constant force what is the modulus of this force? c) Deduce the piano's acceleration.