When the cart moves on an incline at constant speed, it is in equilibrium; i.e., the net force on it is zero. Does it require more, less, or the same tension in the string to pull the cart up the track at constant speed or down the track at constant speed?

The cart requires more tension in the string to pull the cart up the track at a constant speed. and Less tension in the string to pull the cart down the track at constant speed

Description of forces acting on the cart

Given that the cart on an incline is been acted upon by downward gravitational force as it moves down the track it will require less tension ( force ) to pull the cart downwards. But when pulling the cart upwards the incline more tension( force ) is required to overcome the frictional forces of the incline and the downward gravitational force.

Hence we can conclude that The cart requires more tension in the string to pull the cart up the track at a constant speed. and Less tension in the string to pull the cart down the track at constant speed.

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