A 15 kg box is placed at the top of a 5.0 m long, frictionless ramp inclined at an angle of 37o. How long does it take the box to reach the bottom of the ramp?
so the acceleration at the direction of the slope is 3/5g then it's all about mathematics imho. it doesn't really matter how much it weighs tbh, since it's frictionless.
Draw a triangle and break the force of gravity into components using trigonomoetry. Knowing the distance and force you can find acceleration which you can use to find time.