Both! Force is a quaternion quantity, the sum of a scalar force and a vector force. For example there are two gravitational forces, the scalar force Fs= - GmM d/dr 1/r = GmM/r^2 and the vector force Fv= Del -GmM/r = GmM R/r^3.
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Thrust is a force and a force is a vector quantity having a magnitude and direction
vector, power= work/time and work= force * distance, force is vector.
A scalar times a vector is a vector.
Scalar
Time is scalar