A12-kg projectile is launched with an initial vertical speed of 20 m/s. it rises to a maximum height of 18 m above the launch point. what is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent

Change in mechanical energy,

Explanation:

It is given that,

Mass of the projectile, m = 12 kg

Speed of the projectile, v = 20 m/s

Maximum height, h = 18 m

Initially, the projectile have only kinetic energy. it is given by :

K = 2400 J

Finally, it have only potential energy. it is given by :

P = mgh

P =2116.8 J

The change in mechanical energy is given by :

So, the change in mechanical energy is 283.2 J. Hence, this is the required solution.

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