Question

Example 2. A trolly is dragged towards the top of mountain with a velocity of 5.0 m/s using a cable by
a force of 4.0 x 10°N. Trolly takes 5 minutes to reach the top. How much work will be done?
applying​

Answer 1

Explanation:

5min =5*60=300seconds

Force=mass* acceleration

both acceleration and force are in opposite direction

therefore

-400=mass*(-10) acceleration due to gravity

mass=40kg

using Newton's third equation of motion for gravity

2gh=v²-u²

2*(-10)*h=0-(5²)

h=25/20=5/4m

work done=potential energy

=mgh

=40*10*5/4

=500J