Contact forces

$$

$($b$)$

$($E$)$

$($c$)$

$1$

$(1)$

$($a$)$ the spring exerts a force

to the right on the wall

upward on the Earth

to the right on the hand

to the left on the wall

to the left on the hand

downward on the Earth

$($b$)$ the wagon exerts a force

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