Two objects with a charge of 3x 10^-5 C placed 0.5 meters apart. Positive or negative? One object with a charge of 3x 10^-5 and another charge of 4x 10^-5 C placed 1 meter apart. Positive or negative?

Keneila is attempting to ski down a 20 m high friction free hill for the first time. she has a speed 10 m/s at the top. what is her kinetic energy when she is a the bottom, 20 m ? (a)2500 j (b)9800 j (c)12300 j (d)3100j (e)15000j

Will you chech and finish these for me, because i am stumped with them.

Yvette hangs a 2.4kg bird feeder in the middle of a rope tied between two trees. the feeder creates a tension of 480 n in each side of the the rope.