A truck of mass 500kg moves from rest at the top of a section track 400m long and 30m high as shown. The frictional force acting on the truck is 250N throughout this journey. What is the final speed of the truck?
1 Answer
Explanation:
Two forces are acting on the truck at any point of time during its motion.
- weight
=mg , acting downwards. - Force due to friction. Acting along the track and opposing the motion.
Therefore, net force on the truck is the difference of the component of its weight parallel to the track and the frictional force.
Component of gravitational force parallel to track
where
Inserting given vales we get
Net force
From Newton's Second Law of motion
Using the following kinematic expression
Given initial velocity of truck is