This is a speed/time graph.
The slope of the graph at each point is the time rate of change of speed
at that point, and THAT's the definition of the magnitude of acceleration.
The slope of the curve is zero at both ' A ' and ' B ', so acceleration is
zero at both of those points.
That seems to be exactly what choice-c says.
Answer:
Explanation:
Rachel and Sarah are standing on horizontal ground . Let T₁ be the tension between Rachel and Sarah and Sarah is in between you.
Force = mass x acceleration
Apply this equation on Rachel
T₁ = 23 x 2 = 46 N
Let T₂ be tension between Sarah and me and it is inclined at 60°
Force = mass x acceleration
Apply this equation on Sarah
T₂ cos 60 - T₁ = 23 X 2 = 46
T₂ cos 60 - 46 =46
T₂ cos 60 = 92
T₂ = 92 / .5
= 184 N
Answer:
The workdone by P is 
Explanation:
Generally workdone is mathematically represented as

Where F is the force and d is the distance
The total workdone = (Workdone by Force P + Workdone by frictional force )
The difference in kinetic energy

Substituting 5.6 J for
and 4.0 J for 

This change in kinetic energy of the block = The total kinetic energy
The workdone by the frictional force is

the negative sign shown that the force is moving in the opposite direction
substituting 1.2 N for
and 0.5 m for d


Making Workdone by Force P the subject in the above equation we
Workdone by Force P (
) = The total workdone(
) - 
Substitution values

