two blocks of masses m and 3m are placed on a frictionless, horizontal surface. a light spring is attached to the more massive block, and the blocks are pushed together with the spring between them as shown in the figure below. a cord initially holding the blocks together is burned; after that happens, the block of mass 3m moves to the right with a speed of v with arrow3m = 2.70 m/s.(e) if the spring was compressed by 5.00 cm, what is the spring constant of the spring?

Block A (with mass 10 kg) slides along a frictionless floor with a speed of 0.75 m/s and collides with Block B (with mass 12 kg) which was at rest and is attached to a spring with spring constant 24 N/m. The blocks stick together after the collision; what is the maximum compression of the spring?

A 1500 kg car is rolling horizontally at 2 m/s. You would like to stop the car by shooting a 10 kg blob of sticky clay at it, also horizontally. About how fast should you shoot the clay? O 25 m/s O2 m/s O 150 m/s 300 m/s O 0.01 m/s

Cons Block 1, of mass m1 = 2.90 kg , moves along a frictionless air track with speed vị with block 2, of mass m2 = 57.0 kg , which was initially at rest. The blocks stick together after the collision. (Figure 1) 13.0 m/s. It collides %3D Part A Part B Part C What the change AK = Kfinal – Kiniti. in the two-block system's kinetic energy due the collision? Express your answer numerically in joules. • View Available Hint(s) Figure 1 of 1 HV ΑΣφ ? Before collision: m2 m1 AK = 1 Submit After collision: Provide Feedback 1 2.

A 66.0-kg athlete leaps straight up into the air from a trampoline with an initial speed of 7.5 m/s. The goal of this problem is to find the maximum height she attains and her speed at half maximum height. (a) What are the interacting objects and how do they interact? This answer has not been graded yet. (b) Select the height at which the athlete's speed is 7.5 m/s as  y = 0.  What is her kinetic energy at this point? JWhat is the gravitational potential energy associated with the athlete? J(c) What is her kinetic energy at maximum height? JWhat is the gravitational potential energy associated with the athlete? J(d) Write a general equation for energy conservation in this case and solve for the maximum height. Substitute and obtain a numerical answer. m(e) Write the general equation for energy conservation and solve for the velocity at half the maximum height. Substitute and obtain a numerical answer. m/s

Solve number 2

A 130 lb person sitting in a 150 lb iceboat fires a gun, discharging a 2 oz bullet horizontally. If the bullet speed leaving the gun is 1200 ft/s, what will be the speed of the boat after the bullet is fired, if we assume no friction? The correct answer is 0.54 ft/s

Gayle runs at a speed of 3.60 m/s and dives on a sled, initially at rest on the top of a frictionless snow - covered hill. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back and together they continue down the hill. What is their speed at the bottom of the hill if the total vertical drop is 15.0 m? Gayle's mass is 46.5 kg, the sled has a mass of 5.10 kg and her brother has a mass of 30.0 kg.

Two pucks are directed towards each other on an ice rink (along the x-axis.) Puck A has a mass of 0.16kg and is moving with a speed of 1m/s in the positive x-direction. Puck B has a mass of 0.17kg and is moving with a speed of 11m/s in the negative x-direction. Puck A slides away with a speed of 11.36m/s in the negative x-direction. a) Determine the velocity of Puck B after the collision. vecVf.B = ____ . b) To solve part (a), what did you include in your system? Select all that are True. Puck A The ice Puck B c) What did you assume that the total force due to the surroundings on each puck was during the collision? d) The collision is very short; it occurs over 0.048s. Determine the average force that Puck A exerts on Puck B. ? vecF_(A or B)=

Problem-3: A ball of mass 200 gram strikes a wall perpendicular to its surface at a speed of 10 m/s and rebounds back at the speed of 5 m/s. It is in contact with the wall for 2 milli-sec. Find the average force exerted by the wall on the ball.