Answer:
No concave lens cannot be used to make hand lens because in hand Lens we use convex lens so as to converge the rays of the light After refraction and helps to produce a magnified image of an object.
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Potential energy is the an objects energy that is currently not being used but can be used. Example: A ball at the top of a hill is full of potential energy, and as soon as it begins rolling that becomes kinetic energy because it is in use. (Hard to explain but I hope this helps.)
3 minutes = 180 seconds.
If it spent the entire 180 seconds slowing down at the rate of 3.5 m/s every second, then it began the 3 minutes at the speed of (180 x 3.5)=630 m/s. That's about 1,409 mph !
Something that goes round in circles could have a high speed but zero average velocity.
The core or a place called the epic center