Research 2: Ramakrishna and Sandararajan (2005b) performed the experimental investigations of the resistance to impact loading were carried out on cement sand mortar (1:3) slabs. The slab specimens (300 mm x 300 mm x 20 mm) were reinforced with natural fibres (coconut, sisal, jute and hibiscus cannabinus fibres) having four different fibre contents (0.5, 1.0, 1.5 and 2.5% by weight of cement) and three fibre lengths (20, 30 and 40 mm). A fibre content of 2% and a fibre length of 40mm of coconut fibres showed best performance by absorbing 253.5J impact energy among all tested fibres. All fibres, except coconut fibres, showed fibre fracture, at ultimate failure where as coconut fibre showed fibre pull out failure.