A kangaroo jumps up with an initial velocity of 36 feet per second from the ground (assume its
starting height is O feet). Use the vertical motion
model, h = –16t2 + vt +s, where v is the initial
velocity in feet per second and s is the height in
feet, to calculate the amount of time the kangaroo
is in the air before it hits the ground again. Round
your answer to the nearest tenth if necessary.
Time in air:seconds

Your physics assignment is to figure out a way to use electricity to launch a small 6.0-cm-long plastic drink stirrer. you decide that you'll charge the little plastic rod by rubbing it with fur, then hold it near a long, charged wire, as shown in figure p23.56 . when you let go, the electric force of the wire on the plastic rod will shoot it away. suppose you can uniformly charge the plastic stirrer to 10 nc and that the linear charge density of the long wire is 1.0 x10-7 c/m. what is the net electric force on the plastic stirrer if the end closest to the wire is 2.0 cm away?