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

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied. true or false

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.

Isobars are lines of constant or equal pressure on a weather map. they can be used to find areas of low or high pressure over a broad area, and they can tell us how intense the system may be. on weather maps, you may have noticed areas that have a large l or h over a region with lines circling around them. the l stands for low pressure and h stands for high pressure. the lines circling them are isobars. check out the pressure system and isobars over georgia and florida. what is the present weather in this area ? a) clear and sunny b) cold and cloudy c) changing weather d) lots of precipitation