I don't know about it your answer will give another people
Newton's first law of motion is that an object in motion will tend to stay in motion unless an external force acts upon it.
Answer:
1.48kg
Explanation:
Here,
potential energy (P.E) = 29j
height (h) = 2m
acceleration due to gravity(g) =

mass(m) = ?
we know,
P.E = mgh
or, 29 = m×9.8×2
or, 29/19.6 = m
or,m = 1.48kg