A truck accelerates from speed v to 2v. Work done during this isA. three times as the work done in accelerating it form rest to vB. same as the work done in accelerating it form rest to vC. four times as the work done in acceleration it from rest to vD. less than the work done in acclerating it from rest to v

A truck accelerates from speed v to 2v. Work done during this isA. thr

1.	A truck accelerates from speed v to 2v. Work done during this isA. three times as the work done in accelerating it form rest to vB. same as the work done in accelerating it form rest to vC. four times as the work done in acceleration it from rest to vD. less than the work done in acclerating it from rest to v
Answer» Correct Answer - A Work done to accelerate from 0 to v is, `W_(1)=1/2 mv^(2)` Work done to accelerate from v to 2v is, `W_(2)=1/2 m (2v)^(2)` `implies Delta W=W_(2)-W_(1)=1/2 m (2v)^(2) -1/2 mv^(2)=4 W_(1)-W_(1)=3 W_(1)`