Center Of Mass And Collision

A \(1 \mathrm{~kg}\) object strikes a wall with velocity \(1 \mathrm{~m} \mathrm{~s}^{-1}\) at an angle of \(60^{\circ}\) with the wall and reflects at the same angle. If it remains in contact with wall for \(0.1 \mathrm{~s}\), then the force exerted on the wall is :