Solid Front Motor

A 0.50 kg glider on an air track (Fig. Q3, p. 125) is pulled along frictionlessly by a tensile force arising from a hanging 19.0 N weight. Over what distance will it travel in order that 10.0 J of work be done on it?
____m

When a solid-fuel rocket burns, the flame front advances into the material in a direction perpendicular to the ignited surface. By configuring the fuel core in various ways and lighting it along the entire length, one can obtain all sorts of performance characteristics. Figure P15 shows a starred-cavity motor. How much work (in kJ) was done by the device in the first 60 seconds of flight if the rocket rose vertically to a height of 3.5 km in that time? The change in the rocket's mass was negligible.
___kJ
10 kN of thurst for the first 60 seconds and it is constant