Objects accelerate because

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

What object a collides with object b and bounces back its final momentum is?

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?