(1)不算空气阻力的话,h=1/2gt²,∴t=0.5s,根据能量守恒,mgh=1/2m(v2²-v1²),V1=s/t=2/0.5=4m/s,∴V2²=41 ,V2=41的开方
(2)W=mgh-1/2mv²,∴W=5-8x0.5=1J