If a ball is thrown into the air with a velocity of 40 ft/s, its height in feet after t seconds is given by y=40t−16t2. (a) find the average velocity for the time period beginning with t=2 and (1) lasting 0.5 seconds: -32 ft/s (2) lasting 0.1 seconds: -25.6 ft/s (3) lasting 0.05 seconds: -24.8 ft/s (4) lasting 0.01 seconds: -24.16 ft/s (b) find the instantaneous velocity when t=2: ft/s

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?

Which of the following is not an appropriate unit for acceleration? (kg/12 mihr? m/min/sec cm/30c?

)consider two positively charged particles, one of charge q0 (particle 0) fixed at the origin, and another of charge q1 (particle 1) fixed on the y-axis at (0,d1,0). what is the net force f⃗ on particle 0 due to particle 1?