Question

Q5. A stone is thrown vertically upwards. If the mass of stone is 0.4 kg, then find the potential energe
song when it reaches 25 m above the ground. Take g = 10 ms​

Answer 1

Answer:

KE = 1/2 * m * v^2

KE = 1/2 * 0.4 * 9.8^2 = 19.208 J

PE = mgs

Assuming, the ball was thrown from 0 distance from surface,

s = 9.8 * 0.5 + 1/2 * -10 * 0.5^2 = 3.65 m

PE = 0.4 * 10 * 3.65 = 14.6 J

Answer 2

The stone experiences an acceleration due to gravity (g) vertically downwards,g=9.8m/s

2

Mass of stone m=0.5 kg

Force acting on the stone F=mg

∴ F=0.5×9.8=4.9N (vertically downward)