Question

a body of mass 200 gram is thrown in upward direction with velocity 40 m per second which takes the two seconds calculate ke of same body

Answer 1

Equations in use for this question are

v= u- gt

v final velocity u initial velocity g accln due to gravity and t time

-ve symbol because speed reduces when thrown upward due to gravity.

then we will use

KE = 1/2 m v2

From 1st eqn we get v= 19 m/ s

and from 2nd eqn we will get

KE= 36.1 J

Let me know if i am wrong somewhere