Es para la tarea de mi hija please is urgent for my daughter's task A body falls freely taking 7 s to reach the ground.
a) From what height was it dropped?
b) With what speed, in km / h, does it reach the ground?

Now that the first three steps have been explained, identify the next three steps, in order. calculate the magnitude of r sum vector components calculate a and b magnitudes calculate the direction of r, calculate x,y components step 4 step 5 step 6

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.