4.5 Draw a neat sketch of the velocity-time graph for the motion of vehicle P from the
moment the driver sees the wreck until it stops. Take the time when the driver sees
the wreck as t = 0 s.
Clearly show the values of the following on the graph:
Initial velocity of the vehicle
The time when the brakes are applied
The time when the vehicle stops
2​

What is the rate of change in a objects position?

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to:

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.