17. Figure 12 shows a hydraulic lift system. The radius of the small piston is 5.64 cm while that of the large piston is 14.24 cm. The small piston is operated using a lever. A force of 100N is applied to the lever 

Determine the:

a. pressure exerted by the smaller piston. (5 marks)

b. load that can be lifted. (3 marks)

c. mechanical advantage of the system. (3 marks)

18.a. A bus moving initially at a velocity of 20ms-1 decelerates uniformly at 2 ms-2

i. Determine the time taken for the bus to come to a stop. (3 marks)

ii. Sketch the velocity – time graph for the motion of the bus up to the time it stopped. (2 marks)

iii. Use the graph to determine the distance moved by the bus before stopping. (1 mark)

b. A car of mass 1000 kg travelling at a constant velocity of 40ms-1 collides with a stationary metal block of mass 800 kg. The impact takes 3 seconds before the two move together.

Determine the impulsive force.