1.

A man through mass of 2kg vertically upwards with the velocity of 20 m/s . what os a potential energy of the mass after 1 second.

Answer»

Hello Mate!

So, a man threw a mass if 2 kg with velocity of 20 m/s. Since we know that,

Potential Energy = mgh

But we don't have h i.e height so we will find it.

s = ut + ½at²

s = (20)(1) + ½(-10)(1)²

s = 20 - 5 = 15 m

So, potential energy = 2 kg × ( - 10 m/s² ) × 15 m

= - 20 N × 15 m = - 300 J

Hence potential energy is 300 J but against gravity.

Have GREAT FUTURE ahead!


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