If a spacecraft is pushed by a thruster, what will happen

a, the spacecraft will move and then slowly come to a stop on its own.

b. the spacecraft will not move because it only works on earth.

c. the spacecraft will not move due to air resistance.

d. the spacecraft will move and will not stop until it is stopped by an equal and opposite force.

Space-time metric ds2= -dt2+at2dx2+bt2dy2+ct2dz2 (a)how does the area of a rectangle with vertices at ( x=0, y=0, z=0 ), (1,0,0 ), ( 0,1,0 ) and (1,1,0 ) changes with time? (b) if a photon moving in the x direction starts from the origin at t=1, when does it reach x=l? (ds=0 for the trajectory of a photon.) (c) the proper time for a particle is defined by cd=ds. what is the proper time for a particle to move along the trajectory ( x(t)=t, y(t)=0, z(t)=0 ) from t=0 to 1 ? what is the condition on the parameter a so that the velocity of the particle never exceeds the speed of light ?

The metric unit of electrical power is the watt volt ampere ohm

Aforce of 9.00 newtons acts at an angle of 19.0 to the horizontal. what is its component in the horizontal direction?