Question

using the equation vy2-Uyo2 + 2ay(y-%) where a car is moving at an initial speed of 22 m/s slams on the breaks, traveling a distance of 45.6 m before coming to rest. Solving for the acceleration, how many significant figures would it accurately have? 1. b. 2 C. d. 4 True / False: In an elevator the acceleration is magically measured to be -3.00 m/s2 (where + is up and- is down) I therefore know that the elevator is moving down 2. a. True b. False A particle is initially traveling east at 5 m/s, then it begins to have an acceleration of 10 m/s2 in the north direction. What can you say about its velocity after a long period of time 3. a. b. C. It will be completely in the northern direction It will be in both the northern and eastern directions. Neither of the above can be true, it depends on the amount of time True /False: In adding two nonzero vectors whose magnitudes are different from each other, I can never obtain the null or zero vector 4. If Nemo the fish is able to swim at a speed of 3 m/s and he is in the E.A.C. which is an amazing Current with a constant velocity of 4 m/s. Which of the following best describes the speed Nemo can achieve as relative to the bottom of the ocean? 5. a. 1 m/s b. 7 m/s c. 5 m/s d. A or B but not Ce. A, B and C

Answer 1

1- here number of significant figure will be 2 as there is no number after decimal place of 22 so we will round it of to only 2 significant figures and correct answer is 5.3 m/s2

2- true as acceleration is 'g-a' during lift going down as here value of 'a' can be greater than 9.8

3- it will be in both north and eastern direction as body is having an speed in eastern direction.

4-false because if vectors are opposite to each other and have same magnitude then we can get null vector

5- option e is correct as 1, 7 and 5 are all three possible.

When just opposite to current direction then 1, when in the same direction the 7 and when at 90° to current the 5