Exercise 7.23 A2.20 kg mass is pushed against a horizontal spring of force constant 26.0 N/cm on a frictionless air table. The spring is attached to the tabletop, and the mass is not attached to the spring in any way. When the spring has been compressed enough to store 15.0 J of potential energy in it, the mass is suddenly released from rest. Part A Find the greatest speed the mass reaches. Express your answer in meters per second. V ΑΣΦ Vmax = m/s Submit Request Answer Part B Complete previous part(s) Part C What is the greatest acceleration of the mass? Express your answer in meters per square second. ν ΑΣφ amax = m/s2 Submit Request Answer Part D Complete previous part(s)

You drop a ball from a height of 1.8 m , and it bounces back to a height of 1.2 m Part C What is the ball's speed just after the bounce? Express your answer to two significant figures and include the appropriate units. HA ? Vafter = Value Units Submit Request Answer Part D Where did the energy go? O The energy "lost" was changed primarily into thermal energy due to friction. O The energy "lost" was changed primarily into heat energy. The energy "lost" was changed primarily into acoustic energy. O The energy "lost" was changed primarily into chemical energy.

A force in the +z-direction with magnitude 18.0 N- (0.530 N/m)z is applied to a 6.60 kg box F(x) that is sitting on the horizontal, frictionless surface of a frozen lake. F(x) is the only horizontal force on the box. O Part A If the box is initially at rest at r = 0, what is its speed after it has traveled 16.0 m ? Express your answer to three significant figures and include the appropriate units. ? HA Value Units Submit Previous Answers Request Answer

What's the answer for all the parts?

Using energy considerations, calculate the average force (in N) a 63.0 kg sprinter exerts backward on the track to accelerate from 2.00 to 7.00 m/s in a distance of 25.0 m, if he encounters a headwind that exerts an average force of 30.0 N against him. N Additional Materials O Reading

A 2.6 kg block is attached to a horizontal rope that exerts a variable force Fx = (20 – 5x) N, where x is in m. The coefficient of kinetic friction between the block and the floor is 0.25. Initially the block is at rest at x = 0 m. Part A What is the block's speed when it has been pulled to x = 0.80 m? V = μĂ Value m S ?

PM1.1 please explain each step

A mechanic pushes a 3.20 × 103 - kg car from rest to a speed of v, doing 5, 340 J of work in the process. During this time, the car moves 20.0 m. Neglecting friction between car and road, find v and the horizontal force exerted on the car. (a) the speed v m/s (b) the horizontal force exerted on the car (Enter the magnitude.) N