7) A 2.00-kg block slides on a frictionless horizontal surface and is connected on one side to a spring with a spring constant of 45.0 N/m) as shown the figure. The other side is connected to a 4.00-kg block that hangs vertically. The system starts from rest with the spring unextended. (a) What is the maximum extension of the spring? (b) What is the speed of the 4.00-kg block when the extension is 50 cm? Please show all work steps not short cut

'1'} A l-ltg block slides on a frictionless horizontal surface and is connected on one side to a spring with a spring constant ursso Him} as shown the gure. The other side is connected to a 4.D-ltg block that hangs vertically. The system starts from rest with the spring unextended. {a} What is the maximum extension of the spring'.Jr {bl What is the speed of the 4.D-ltg block when the extension is St} cm'.'I