Q5.7Multiple choice
A body of mass 2kg travels according to the law x (t ) = pt + qt 2 + rt 3 where p = 3 m s−1 , q = 4 m s−2 and r = 5 m s−3 . The force acting on the body at t = 2 seconds is
- (a)136 N
- (b)134 N
- (c)158 N
- (d)68 N Laws of Motion
A body of mass 2kg travels according to the law x (t ) = pt + qt 2 + rt 3 where p = 3 m s−1 , q = 4 m s−2 and r = 5 m s−3 . The force acting on the body at t = 2 seconds is