The integral of acceleration is velocity. The area under the curve is an integral. You can see the relation here. So just take the area under those time intervals. I’m assuming 1.7 is where it crosses the x-axis
For the first interval:
Base = 1.7
Height = -2
[1.7*(-2)]/2 = -1.7 cm/s
For the second interval:
There are two triangles and a rectangle here.
Base #1 = 0.3
Height #1 = 1
Base #2 = 1
Height #2 = 1
Length = 3
Width = 1
Apply the area formulas to get an answer of 3.65 cm/s
Maybe it’s suppose to say fuel or something fossil fuel or something like that
Answer:
Approximately 
.
Explanation:
The net force on the girl would be:
.
Under the assumptions, the net force on this girl would be equal to the tension force in the rope. All other forces on the girl would be balanced.
In other words, the tension force that the rope exerted on the girl would be 
. The girl would exert a reaction force on the rope at the same magnitude (
) in the opposite direction. This force would translate to a 
force on the boy towards the girl.
Under similar assumptions, the net force on the boy would also be . Since the mass of the boy is 
, the acceleration of the boy would be:
.
