1.

a small child succeeds in lifting a mass of 10 kg on his head but loses balance and the object fall back to the ground if the child has a height of 90 cm find the kinetic energy with which the object strikes the ground 

Answer» Given,

Mass = 10 kg

Height = 90 cm = 0.9 m

Now, from 3rd equation of motion,

v²-u²= 2as

v² = 2×9.8×0.9+0²

v² = 17.64 m/s

Now, we know that,

K.E. = 1/2mv²

K.E. = 1/2×10×17.64

K.E. = 88.2 Joules


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