The displacement x of a body varies with time t as x=23t2−16t+2. In what time that body comes to rest? (x is measured in meter and t in second)
The displacement of a body of mass 2 kg varies with t as S=t2+2t , where S is in meters and t is in seconds. The work done by all the forces on the body during the time interval t = 2s to t = 4s is