Jason takes off from rest across level water on his jet-powered skis. The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible). The skis have a thrust of 200 N and a coefficient of kinetic friction on water of 0.10. Unfortunately, the skis run out of fuel after only 11 s. How far has Jason traveled when he finally coasts to a stop

Explanation:

Given :

Combined mass Kg

Thrust force 200 N

Coefficient of kinetic friction 0.10

According to newton's law

   ( ∵ )

Before run out of fuel the acceleration is,

Distance covered in 11 sec. is given by,

Where distance, initial velocity = , acceleration,

  m

After run out of fuel velocity of body is,

Where 0

After fuel run out of only frictional force act on body,

Acceleration is given by,

So distance traveled by body after run out of fuel is given by

Where  initial velocity 0,

    m

So total distance traveled by body is,

m

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask