What is the unknown mass and weight

Question

using the initial valocity(0.82), final velocity (0.85) , distance (0.8m) and mass of 26.94 grams, find net force

Answer 1

Mechanics problems are usually about finding the net force and then the motion or knowing the motion and finding the net force. Here we find a, and then substitute a into F_net = ma in order to find the net force.

Const a equation of motion to use to find a given v_f, v_i, and d is 2ad = v_f² - v_i²

a = (v_f²-v_i²)/(2d) now, just substitute in. v's need to be in m/s. Also the final v is lower than the initial v, so you should expect both a and F to be negative values.

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