Kamala puts on inline skates and stands facing a wall. When she pushes against the wall, she rolls backward.Why does pushing harder make her roll faster?

When Kamala pushes harder on the wall, the wall pushes back on her with a greater force in the opposite direction. That backward force makes her accelerate more, so she rolls faster. This is Newton’s third law: the wall’s force on her matches her push on the wall in size and acts in the opposite direction.

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