Acar and truck are both travelling with a constant speed of 20m/s. the car is 10m behind the truck. the truck driver suddenly applies his brakes ,causing the truck to decelerate at the constant rate of 2m/s. two second later the driver of the car applies his brakes and just manages toavoid a rear end collision. determine the constant rate at which the car decelerated.

Two conductors, a and b, are each in the shape of a tetrahedron. but of different sizes. they are charged in the following manner: 1. tetrahedron a is charged from an electrostatic generator to charge q. 2. tetrahedron a is briefly touched to tetrahedron b. 3. steps 1 and 2 are repeated until the charge on tetrahedron b reaches a maximum value. if the charge on tetrahedron b was q/4 after the first time it touched tetrahedron a. what is the final charge qbmax on tetrahedron b?