arm length 1.2m hand force down 360 N Problem 12. The position function of a particle is given by s(!) = * - 1215 + 45t+ 3, where time, t, is in seconds, distance, s, is in metres, and # 2 0. Find the velocity of the particle when the acceleration is zero. 13. An airplane is on a heading of 075 at 250 km/h and an 85 km/h wind is blowing from 300. Determine the resultant velocity of the airplane, using Cartesian vectors, and state the groundspeed and bearing of the resultant.6. Determine f"(1) for the function f(x) = [ 3x2 - 5x ]" 7. The position function of a particle is given by s(1) = 21 + 41 -t, where time, t, is in seconds and distance, s, is in metres. Find the velocity and acceleration after 4 s. x* +2 8. Find the equation of the tangent to the curve f(x) = (x2 + 3x- 1)3 at X = 0. 9. For the function f(x) = 16+ 4x+ x - 3x , find the point of inflection. 10. The height, h, in metres, of a firework as a function of time, t, in seconds, is given by h(!) = -4.9:" + 981 + 2. Determine the maximum height of the firework. Verify it is a maximum. 1 1. Find the torque at the point A, the shoulder joint