일반물리학 1 — Force and Motion-I: Problem 35

35 An object weighs 2.50 kg. In time t, measured in seconds, the velocity of the object is given by \(\vec{v} = (7.00t \hat{i} + 2.00t^2 \hat{j}) \text{ m/s}\). At the instant the net force on the object has a magnitude of 35.0 N, what are (a) the direction of the net force and (b) the object's direction of travel?