Ch7_1
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Make sure to calculate your answers in SI units unless specified otherwise .
1) An object of kg mass has a horizontal velocity component of m/s and a vertical velocity component of m/s. What is the magnitude of the momentum of the particle (see sheet 3;(7.1) stands for 2 equations, x-and y-component) ? Indicate with a negative (positive) sign whether the SI unit of momentum is the combination kg·m/s reflecting the definition of momentum (is the combination kg·m/s contracted into a new name)
2) An object is acted upon by a force of N for s. What is the change in the object's momentum (see sheet 4)? Indicate with a negative (positive) sign whether the direction of the momentum-change vector is in the direction ( opposite direction) of the force ?
3) A gram object with an initial velocity of m/s is brought to rest by a N force. How long is the force active (see sheet 3,4) ?
4) Two cars collide in a perfectly inelastic collision. The mass of car(1) is kg and the mass of car(2) is kg. What is the velocity of car(2) after the collision if the velocity of car(1) after the collision is m/s?
NOTE! For #5,6 see the corrected sheet 15' under "Lectures" on the web! 

5) Two cars, car(1) with kg mass and a velocity of 15 m/s and car(2) with kg mass and unknown velocity approach an intersection at 90o with respect to each other and collide. Immediately after the collision the cars slide stuck together with a velocity of m/s. What is the speed of car (2) before the collision (see sheet 10,12-15, 15' summarizes the quick way ) ?

6) Two cars, car(1) with kg mass and a velocity of m/s and car(2) with 2000 kg mass and unknown velocity approach an intersection at 90o with respect to each other and collide. Immediately after the collision the cars slide stuck together with a velocity of m/s. What is the angle between the momentum of the car wreck and the initial direction of car (1) (see sheet 10,12-15, 15' summarizes the quick way) ?

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