Aman pulls a 100 n crate up a frictionless 30° slope 5 m high as shown. assuming that the crate moves at constant speed, the work (in m·n) done by the man is:

Answer : Work done by the man is zero.

Explanation :

It is given that,

A man pulls a 100 n crate up a friction less 30° slope 5 m high. We know that the work done is given by :

Where,

F is the applied force

d is the displacement

is the angle between the force and the displacement

In this case, the crate moves with constant velocity. This means the acceleration of the crate is equal to zero. So, the net force will be zero.

Hence, the work done by the man is zero.

the rearrangement of particles in a physical change. hope this

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me