If a radioactive element has diminished by 7/8 of its original amount in 30 seconds, what is its half-life? O 20 s None of the given options. O 5 s O 10 s O 2.5 s

As an object freely falls downward, its..? A. acceleration increases B. velocity increases C. velocity and acceleration increases D. neither velocity nor acceleration increases E. velocity increases but acceleration decreases

What are 3 ways an object can have acceleration? Choose the best 3 answer please. 1. Have a high speed  2. Decrease speed  3. Change direction  4. increase speed  5. Remain at rest 6. Have constant velocity

Q13. An airplane starts at rest at the end of a runway. If it reaches a speed of 80 m/s in 18 s, what is the plane's acceleration?

QUESTION 19 When a car gets to the bottom of a hill, the driver releases the accelerator so that the car coasts up the hill. If the car reaches a vertical height of 10 m from the bottom of the hill, what was the initial speed of the car at the bottom? (Neglect rolling friction and assume that the car does not slide.) а. 14 m/s b. 10 m/s C. 16 m/s d. 18 m/s е. 12 m/s