a lorry of mass 2000 kg moving with a speed of 50 km per hour to live with a drum of mass 25 kg at a police checkpoint. the velocity of the lorry after the impact of 34 kilometre-per-hour what is the velocity of the drum​

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

The magnetic field inside a superconducting solenoid is 4.50 t. the solenoid has an inner diameter of 6.20 cm and a length of 26.0 cm. determine (a) the magnetic energy density in the field and (b) the energy stored in the magnetic field within the solenoid.

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.