3 1 1 3 4 5 t (s) By how much does the velocity change between t = 1 s and t = 5 s? It decreases by 2 m/s It increases by 2 m/s It decreases by 1 m/s It changes by 5 m/s O It increases by 1 m/s (s/u) A

13 J At the maximum height the velocity of a particle thrown vertically up is. Infinity O 9.8 m/s O 9.8 cm/s O Zero O

What is her velocity at 15 s?

8

(2) Two cars are 150 kilometres apart and travelling toward each other. One car is movng at 60 km/h and the other is moving at 40 km/h. In how many hours will they meet? A) 2.5 h B) 2.0 h C) 1.75 h D) 1.5 h E) 1.25 h 40 156km

Question 5 You measure the velocity of falling object at several times given in the table below. Time (s) Velocity (m/s) 0.00 0.08 0.10 1.05 0.20 2.05 0.30 3.03 0.40 3.84 0.50 4.98 0.60 5.78 0.70 6.88 0.80 7.84 0.90 8.73 1.00 9.89 The acceleration is the slope of the fit line. Use the Data Analysis ToolPak in Excel (or any other linear regression tool) to determine the acceleration and its uncertainty from the slope of the fit line and its standard error. O 19.71 + 0.07) m/s? O 9.81 z 0.07) m/s? O0.70.1) m/s (9.75 + 0.04) m/s? (9.80 + 0.01) m/s

A car is initially at rest on a straight road. The graph shows the acceleration of the car along that road as a function of time. Me 2 1 " 11 4 4 a 4 1 4 7 . And What is the speed of the car at t-? s? 15 11 12 13 14 Tries 0/99 How much distance does the car cover in the first 9 seconds? Tries 0/99 What is the speed of the car at t-14-s? Tries 0/99 Determine the distance covered by the car between t-11s and t-13 s? Tries 0/99

How far does a car going 12 m/s travel in 6 s? How far would a jet going 160 m/s travel in 6 s? car's distance m jet's distance E E

7) An object has an initial velocity v, = 4î +5ĵ m/s. After 10 seconds of motion, its velocity %3D was found to be v, =-6i +15j. The average acceleration is: %3D