Need help for this using MATLAB 5 and 6 only please. Thankyou, Godbles!

4. The displacement s of the end of a stiff at time t seconds is given by s = ae-kt sin(2nft) Determine the equation of the velocity of the end of the spring, if a =2, k = 0.9 and f -5. Answer: V dV AS = Jv 5. The entropy change (AS), for an ideal gas is given by: SC- Where T is the thermodynamic temperature, V is the volume and R = 8.314. Determine the entropy change when a gas expands from 1 liter to 3 liters for a temperature rise of iOOK to 400K given that: Co = 45 + 6 x 10-4T+8 x 10-62 Answer: 6. The root mean square (rms) value for a certain function f(x) can be written as: rms = 16-a m?dx Given the equation of the sinusoid below, determine the rms value of the voltage v(t) for a half cycle. v() = 100 sint