Answer:

Explanation:
Let say the empty wagon has mass "M"
now by newton's II Law we will have

now it is given that empty wagon is pulled with acceleration 1.4 m/s/s
now we will have

now a child of mass three times the mass of wagon is sitting on the empty wagon
so here we have


so we have

When the force of air resistance on the skydiver
is equal to the skydiver's weight.
Answer:

south of east
Explanation:
= 3 m/s
=
north of east
= 6 m/s
=
south of east =
north of east
x and y component of 


x and y component of 



Magnitude

Direction

The magnitude of the change in velocity vector is
and the direction is
south of east.
Answer:
electrical signal is transferred in electrical wire
Explanation:
electrical signals are transmitted between segments of the axon by successive opening of channels down the atonal membrane with negative and positive charge fluxing on either side of the membrane through selectively permeable chlorine , sodium or potassium channels.
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