Aparticle moves on a coordinate line with acceleration startfraction d squared s over dt squared endfraction equals 45 startroot t endroot minus startfraction 21 over startroot t endroot endfraction d2s dt2=45t− 21 t, subject to the conditions that startfraction ds over dt endfraction equals 6 ds dt=6 and sequals=1818 when t equals 1t=1. find the velocity v equals startfraction ds over dt endfractionv= ds dt in terms of t and the position s in terms of t.

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.