While skiing in Mammoth, Mrs. Steward has a speed of 15m/s at the bottom of the slope. She slows to a stop while traveling a distance of 15m. If she has a mass of 75kg with all her gear on, what is the magnitude and direction of the stopping force? What do we call this stopping forces?

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 ?

Need in all of themmm only answer if you know plsssss

Place me with this question is my last question