Question
A ball of mass 10 g moving with acceleration of 20 m/s2 is hit by a force which acts on it for 0.1 sec. The impulsive force is
1.2Ns
0.3Ns
0.1Ns
0.5Ns
Solution
B.
0.3Ns
Here:- Mass of the ball m= 10 g ; time dt =0.1 sec ;
acceleration of the ball = 20m/s2
Force F =ma =0.15×20 =3N
Impulsive forces are forces that act over short times producing rapid changes in motion
Impulsive force = F×dt = 3×0.1 =0.3 Ns
