In the above question, the impulse acting on the object is

In the above question, the force acting on the object is

In the above question if there is air in the object space and water in the image space, then the focal length is

If the object is at rest and no external force is applied on the object, the static friction acting on the object is

An object of mass 10 kg moving with a speed of 15 ms- hits the wall and comes to res within (a) 0.03 second (b) 10 second. Calculate the impulse and average force acting on the object in both the cases