The roller coaster in starts at the top of a straight track that is inclined 30 with the horizontal. This causes it to accelerate at a rate of 4.9 m/s2 (1/2 g). (a) What is the roller coaster's speed after 3 s?

(b) How far does it travel during that time?

31. The graph in Figure 1.40 shows the velocity versus time for a 32. Ab bullet as it is fired from a gun, travels a short distance, and be enters a block of wood. Compute the acceleration at the this times marked a, b, and c. ave (a) 800 ( c ) 600 (d) v (m/s) 400 33. A d 200 aver a b O 0 0.001 0.002 0.003 t (seconds) Figure 1.40 Problem 31