Saved Bookmarks
| 1. |
2. A stone of mass 500 g is thrown vertically upwardswith a velocity of 15 m s-1. Calculate : (a) thepotential energy at the greatest height, (b) the kineticenergy on reaching the ground, and (c) the totalenergy at its half way point. |
|
Answer» Kinetic Energy, K.E=0.5×m×v 2
K.E=0.5×0.5×15×15=56.25J As it has 56.25 J at the initial POINT as total energy, at some point X,Potential Energy(P.E.) is maximum. Total energy=P.E.+K.E. 56.25=P.E.+K.E. As energy is CONSERVED total energy at point X also must be 40 J. For P.E to be maximum K.E. must be zero. Hence P.E.=56.25J |
|