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Analyzing motion using Newton's laws

Problem

A bird is flying in a straight line towards the left. At t, equals, 0, it starts to slow down and sits on a branch at t, equals, t, start subscript, 1, end subscript. It stays on that branch thereafter.
Which of these could correctly describe the variation of the net force on the bird from t, equals, 0 to t, start subscript, 1, end subscript?
Note: Assume the bird is traveling in a horizontal line and doesn't move up or down.
Choose 1 answer:
Choose 1 answer:
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