Please help and answer in detail

SPH4U ELASTIC POTENTIAL ENERGY ASSIGNMENT 1. A 1.5 kg block is placed against a compressed spring, which has a spring constant of 40 N/m. The spring is compressed 2.4 m, after which the block is released. What speed is the block going when it leaves the spring [3] 2. A toy is hanging at rest at the end of a spring. The toy is 350 g, and stretches the spring 10 cm. What is the spring constant? [2] 3. Two toy cars, m1 = 2.0 kg and m2 = 4.0 kg, are at rest with a compressed spring between them. When the spring is released, the carts shoot off: m1 goes at 6.0 m/s [left], and m2 = 3.0 m/s [right]. If the spring constant was 240 N/m how much was the spring compressed? [4] 4. A 6.00 kg rock is lifted straight up to a height of 4.0 meters above the ground. a. How much work is done by the lifting force on the rock? [2] b. If the rock is lifted in 1.12 seconds by a person, what is the power of this person? [2] 5. Engineers do a test run with a 500. Kg roller coaster car. It starts at point A with a speed of 1.5 m/s. a. If the track is frictionless, how high will the car go at point E before it comes to rest? [3] b. If the track is frictionless, calculate the speed at the top of the loop (Point D) which has a radius of 20. M? [3] c. Now with friction: For the same car, what is the speed at the top of the loop (Point D) if 3% of the total energy has been transformed into unusable heat energy from friction up to that point? Point A still starts at 1.5 m/s [3] This sequent of the track, as the car enters the hill, 60 m is a place of a curve. 20