Question: [Maximum mark: 17] An object moves along a straight line. Its velocity, vms', at time t seconds is given by v(t)=-t+t2t+6, for 0t4. The
[Maximum mark: 17] An object moves along a straight line. Its velocity, vms', at time t seconds is given by v(t)=-t+t2t+6, for 0t4. The object first comes to rest at t = k. 7 2 The graph of v is shown in the following diagram. At t=0, the object is at the origin. (a) Find the displacement of the object from the origin at t = 1. [5] (b) Find an expression for the acceleration of the object. [2] (c) Hence, find the greatest speed reached by the object before it comes to rest. [5] (d) Find the greatest speed reached by the object for 0t4. [2] (e) Write down an expression that represents the distance travelled by the object while its speed is increasing. Do not evaluate the expression. [3]
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