Answer:
-34.3m/s
Explanation:
first lets find the time befor it hit the ground by using free fall equation and we know we use that in one condition which is a constant acceleration in this case its a gravitational acceleration which is -9.8
now we know that the initial velocity its zero :
so applu the another kinematic equation which is
v is final velocity and u is the initial velocity and its equal zero.
v = - 9.8 × 3.5 = - 34.3
Aluminum foil because it has aluminum and that can conduct to electric
I cannot see all the questions, what is 18,19 and 21? (: