Answer:
After 9 seconds the object reaches ground.
Step-by-step explanation:
We equation of motion given as h = -16t²+128t+144,
We need to find in how many seconds will the object hit the ground,
That is we need to find time when h = 0
0 = -16t²+128t+144
16t²-128t-144= 0
Negative time is not possible, hence after 9 seconds the object reaches ground.
Answer:
Gravitational potential energy stored is 9.8 J.
Given:
G = 9.8
height = 0.5 m
mass = 2 kg
To find:
Gravitation Potential energy stored = ?
Formula used:
Potential energy = mGh
m = mass
G = acceleration due to gravity
h = height
Solution:
Potential energy of the object is given by,
Potential energy = mGh
m = mass
G = acceleration due to gravity
h = height
Potential energy = 2 × 9.8 × 0.5
Potential energy = 9.8 Joule
Gravitational potential energy stored is 9.8 J.