An automobile travels for 90 mintues along a highway

5.

The correct answer occurs when the slope changes. Anything from B on is a positive slope and a constant velocity. So all the answers past B are incorrect and only A and B have a changing speed. A <<< Answer

6.

C can still be acceleration especially when moving in a circle, even a horizontal one. A is included in B so A is not the answer. D is not correct because if it is coming down it could be accelerating and any constant speed except when changing direction is not going to give you an acceleration. The answer is B

7.

Your answer is correct. After stopping there's only one way the object can go and that is down. It was experiencing an up down acceleration going up. When it stops, the upward acceleration is no longer there. Gravity never quits and is always there.

8.

A and B are both possible A is increasing speed to pass one and it's direction is not really changing, so the acceleration is going in the same direction. B is also possible, There is a force involved that pushes the object in the opposite direction to the way it's travelling now. C is likely your answer. D is like the rock being thrown up. E is almost the definition for acceleration.

9.

The is an application of a slope question in math.

v1 = 89 km/hr

v2 = 37 km/hr

t1 = 8 seconds

t2 = 10 seconds.

a = (v2 - v1)/(t2 - t1)

a = (40 - 20) / (8 - 10)

a = (20 ) / - 2 = - 10 m/s Work through this one carefully. The answer is correct but the numbers may not be in the right order.

10.

This is rather an interesting question. How to do it is the problem. You could convert the km/hr to m/s twice and then divide by time. It is easier to find the difference first and then convert.

V2 = 37 km/hr

v1 = 89 km/hr

v2 - v1 = 37 - 89

v2 - v1 = - 52 km / hr

52 km / hr [ 1000 m / 1 km]* 1 hr/3600 sec] = - 14.4 m/s

a = Δv / Δt = - 14.4v / 6 = - 2.41 m/s^2