A train of mass 40 000 kg travelling at 150 mph comes to a stop in a distance of 1 km. The initial velocity of the train is 67 m/s. a) Calculate the initial kinetic energy of the train. Show your working. Give the unit.
b) Calculate the acceleration of the train as it comes to a halt. Show your working. Use the equation:
(final velocity squared) − (initial velocity squared) = 2 x acceleration x distance

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

Marcella is a four-year-old girl who is a victim of emotional child abuse. based on the child and family services improvement and innovation act of 2011, which action should the government take for marcella? a. the state should arrest marcella’s abuser. b. the state should find a home for marcella as soon as possible. c. the state should enforce stricter laws in the area where marcella resides. d. the state should provide medical assistance to marcella.

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.