Shot put: 综述： 跳高：high jump、 跳远：long

综述： 跳高：high jump、 跳远：long jump、三级跳远：three step jump、 撑竿跳高：pole vaul、铅球：shot-put、铁饼：discus-throwing、标枪：javelin throwing、链球：hammer-throwing。 例句： 1、速度是所有 田径运动 项目的关键要素。 Speed is the essential ingredient of all athletics. 2、田径运动的项目很多，例如跳高、跳远、 百米赛跑 等。 There are many track-and-field events, such as the high jump, the long jump ... A shot - put is a metallic sphere of radius 4.9 cm. If the density of the metal is 7.8 g per cm 3, find the mass of the shot - put . (Take π=22/7) Since the shot - put is a solid sphere made of metal and its mass is equal to the product of its volume and density, we need to find the volume of the sphere. Initial KE of the shotput = 1 2(10 kg)(1 m/s2)= 5 J Initial P E of the shotput at a height 1.5 m above ground = mgh = (10 kg)(10 m/s2)(1.5 m) =150 J Total initial energy of the shotput =155 J Since air resistance is negligible and final potential of the shotput as it hits the ground (h =0) is zero, kinetic energy of the shotput on hitting the ground = 155 J.