A horizontal force of 120N is required to push a block across a floor at constant velocity, what is the net force acting on the block?

Aplane flies directly between two cities, a and b, which are separated by . from a to b, the plane flies into a headwind. on the return trip from b to a, the wind velocity is unchanged. the trip from b to a takes less than the trip from a to b. what is the airspeed of the plane, assuming it is the same in both directions

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Can you match these to the correct definition