physic question

QUESTION 2 (a) With the aid of diagram, shows Newton's 2nd Law in any TWO (2) coordinate system. [6 marks] (b) During a bicycle race, a cyclist moves from top of hill P to the valley O with velocity of 3.3 m/s as shown in Figure Q2(b). The combine weight of the cyclist and his bike is 65 kg. Calculate the velocity and normal force at point @ if he stops pedalling at point P. 3.3 m/s p = 12 m 10 m Figure Q2(b): Cyclist moves from top hill. [9 marks] -14- SULIT SULIT (c) In an accident as shown in Figure Q2(e), a 200 kg car hits a traffic light post with speed of 40 km/h. The front end of the car deforms 35 cm length, in order to stop the car. (i) Draw the free body diagram of force acting to the car. [3 marks] (ii) Determine the average horizontal force causing the deformation by assuming the car is free roll during collision. [7 marks] 45 km/h Figure Q2(c): A car hit traffic light post