21. The graph shows a car's acceleration over time. Car's Acceleration Over Time 4 Time (s) If the car started from rest, what would be the car's speed in meters per second after 3 seconds? ( PREVIOUS O 18 O 19 O 20 16 17 21 hp DII # $ % 2 4 Acceleration (m/s²)

Q16) Let A = 2i + 3j + k and B = i-3j – 2k. What is A x B ? A) - 3i + 3j – 6k B) - 3і + 5j — 9k C) - 4i +3j – k ma D) - 9i – 3j – 3k

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3. A speeding car going 30 m/s passes a police car that is at rest. At the moment the speeder passes, the police car pulls out and accelerates 4 m/s/s. The speeder continues going 30 m/s. Which is ahead and by how much after 10 seconds? When does the police car catch the speeder?

A racecar driver steps on the gas, and his racecar travels 20 meters in 2 seconds starting from rest. The acceleration of the racecar is 00 5 m/s². 9.8 m/s². O 10 m/s². O 20 m/s².