Emma is riding on a train. the train is moving at 50 m/s. emma walks down the aisle at 1 m/s relative to the train in the same direction the train is moving. what is her relative velocity? also, i know the equation for relative velocity is "t = δx ÷ v" but how would that fit into this type of equation? ? show your work!

Ablock of mass m slides on a horizontal frictionless table with an initial speed v0 . it then compresses a spring of force constant k and is brought to rest. the acceleration of gravity is 9.8 m/s2. how much is the spring compressed x from its natural length? 1) x = v0*sqrt(k/(mg)) 2) x=v0*sqrt(m/k) 3) x=v0*((mk)/g) 4) x=v0*sqrt(k/m) 5) x=v0*(m/kg) 6) x=v0*sqrt((mg)/k) 7) x=(v0)^2/(2g) 8) x=v0*(k/(mg)) 9) x=(v0)^2/(2m) 10) x=v0*((mg)/k)