Question

A graph of titled velocity versus time with time in seconds on the x axis numbered 0 to 10 and velocity in meters per second on the y axis numbered 0 to 50. The graph has a line from the origin to (1, 30) labeled A, a line from (1, 30) to (3, 30) labeled B, a line from (5, 40) to (6, 10) labeled C, a line from (6, 10) to (7, 10) labeled D and a line from (9,40) to (10, 20) labeled E.

The velocity of a 1.3 kg remote-controlled car is plotted on the graph.

The work of segment A is
J.

Answer 1

Work = change in kinetic energy: W = 1/2 m (v_f^2 − v_i^2) = 1/2·1.3·(30^2 − 0^2) = 0.65·900 = 585 J.