Question

a hammer of mass 2kg is raised to the height of 5m. It's potential is:
a) 980 J
b) 98 J
c) 9.8 J
d) 58.8 J
Pls answer fast!​

Answer 1

Answer:

Solve like this, the numbers are different

Explanation:

Gravitational potential energy is given by the expression,

W = m g h

where,

h = Height above the ground = 10 m

m = Mass of the object = 50 kg

g = Acceleration due to gravity = 10 ms - 2

W = 50 × 10 × 10 = 5000 J.

At half way down, the potential energy of the object will be, 5000/2 = 2500 J

At this point, the object has an equal amount of potential and kinetic energy. This is due to the law of conservation of energy. Hence, half way down, the kinetic energy of the object will also be 2500 J.

Answer 2

Potential energy, U=mgh=2*9.8*5=98 J so option b is correct