Answer:
A
Explanation:
The line(A) goes throughout the entire picture. So therefore choice A would be it's length.
Answer:
F = 51.3°
Explanation:
The component of weight parallel to the inclined plane must be responsible for the rolling back motion of the car. Hence, the force required to be applied by the child must also be equal to that component of weight:

where,
W = Weight of Wagon = 150 N
θ = Angle of Inclinition = 20°
Therefore,

<u>F = 51.3°</u>
What does thrice mean not being mean or anything just saying so I can help with the question