A 5 g dart is shot with a speed of 400 m/s into a 2.3 kg block initially at rest attached to a 120 N/m spring and gets lodged in the block. Friction is negligible. a. Find the amplitude of the dart-block system.
b. Find the speed of the dart-block system when it return to equilibrium.
c. Find the period of the dart-block system.

The second largest public utility in the nation is the sole provider of electricity in 32 counties of southern florida. to meet the monthly demand for electricity in these counties, which is given by the inverse demand function p = 1,200 – 4q, the utility company has set up two electric generating facilities: q1 kilowatts are produced at facility 1, and q2 kilowatts are produced at facility 2 (so q = q1 + q2). the costs of producing electricity at each facility are given by c1(q1) = 8,000 + 6q12 and c2(q2) = 6,000 + 3q22, respectively. determine the profit-maximizing amounts of electricity to produce at the two facilities, the optimal price, and the utility company’s profit