87.3 A vertically oriented spring Example 1: as shown in Fig. 1, n when the block of mass m falls freely and make a completely h unelastic collision with the plate of mass m, the system will oscillate up and down. Find the k T,Aandφ of the motion. 1g. Solution: The system is composed of 2 m and k. The angular frequency and the period are respectively 2m T=2丌 2m k 7.3 A vertically oriented spring From the initial condition ≈、mg∠0 k h m2gh=2m→V >0 t=0 2 We can obtain the amplitude k A=1x6+2 42 mg 1+ kh mg7 §7.3 A vertically oriented spring Solution: The system is composed of 2 m and k. , 2m k ω = k m T 2 = 2π The angular frequency and the period are respectively m m h k Example 1: as shown in Fig. 1, when the block of mass m falls freely and make a completely unelastic collision with the plate of mass m, the system will oscillate up and down. Find the T, A and φ of the motion. Fig. 1 §7.3 A vertically oriented spring 0 2 0 = > gh v 0 0 2 2 0 m gh mv k mg x = =− < m m h k x o t =0 0 v r x0 From the initial condition mg kh k mg k mgh k v m g A x = + = + = + 1 2 2 2 2 2 2 0 0 ω We can obtain the amplitude