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

Alow cost, low earth orbit (leo) satellite is to be fabricated at a university, for subsequent launch by rocket. what are the constraints and objectives for selection of a material suitable for the satellite bus (i. e. the structure)? explain each in brief. (15 marks) b)suggest sources of data which could support the selection of materials for applications in space. (5 marks) c) set weights for the objectives listed in (2a) using the digital logic method. (5 marks)

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?