A body of mass 2kg travels according to the law \(x \left( t \right) = pt + \left(qt\right)^{2} + \left(rt\right)^{3}\) where,\(\) \(p = 3 ~\text{ms }^{−1 },\) \(q = 4 ~\text{ms }^{−2}\) and \(r = 5 ~\text{ms }^{−3}\). The force acting on the body at \(t = 2 ~\text{s }\) is
1. | 136 N | 2. | 134 N |
3. | 158 N | 4. | 68 N |
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