I need the solves of these questions

Current Attempt in Progress Over a time interval of 2.01 years, the velocity of a planet orbiting a distant star reverses direction, changing from +21.3 km/s to -16.5 km/s. Find (a) the total change in the planet's velocity (in m/s) and (b) its average acceleration (in m/s2) during this interval. Include the correct algebraic sign with your answers to convey the directions of the velocity and the acceleration. (a) Number Units q1 (b) Number Units The data in the following table describe the initial and final positions of a moving car. The elapsed time for each of the three pairs of positions listed in the table is 0.490 s. Review the concept of average velocity in Section 2.2 and then determine the average velocity (magnitude and direction) for each of the three pairs. Note that the algebraic sign of your answers will convey the direction. Initial position Xo Final position x (a) + 1.72m + 6.24m (b) + 6.34m + 2.00m q2 (c) - 3.01m + 7.21m (a) v = i (b) v = i (c) V = i A motorcycle has a constant acceleration of 4.82 m/s2. Both the velocity and acceleration of the motorcycle point in the same direction. How much time is required for the motorcycle to change its speed from (a)39.8 to 49.8 m/s, and (b)69.8 to 79.8 m/s? (a) Number Units 93 (b) Number i Units C