Question

12. A ball is thrown onto a floor at an angle. If itsvelocity vector is 4i-3 (m/s) and restitutioncoefficient is2/3then, the velocity by which itrebounds is(1) 4i+2j(2) 4i- 2j(3)-4i+2j(4) -4i+3)j

Answer 1

Answer:

(a) 4i+3j

Explanation:

when an object collides with an immovable object it only effects the velocity/acceleration component of the ball perpendicular to the floor. so there's no change in the i component, the j component :(1) changes direction so multiply by -1 (2) changes it's velocity, for ideal cases restitution coefficient is 1 so it doesn't change the velocity here since it's 2/3 u need to multiply that to the initial velocity u get j component to be 2j