a car of mass 1600 kg collides head on with a parked truck of mass 2000 kg. Spring mounted bumbers ensure that the collision is essentially elastic. If the velocity if the truck is 17 kg/h after the collision and the cars final velocity was -2.25 kg/h. What was the initial speed of the car? (m1v1,i + m2v2,i = m1v1,f + m2v2,f)

Acharge q experiences no net force at a particular point in space. which of the following situations described below must always be true? -there are no other charges nearby. -if there are other charges nearby, they must all have the same sign as q. -if there are other charges nearby, they must all have the opposite sign of q. -if there are other charges nearby, the total positive charge must equal the total negative charge. -none of the above