Question

If a ball has a height of 10m and a mass of 0.5 kg, what will be it's KE after it has fallen halfway to a height of 5m?

Answer 1

Answer:

The Kinetic Energy is 24.5 J.

Explanation:

Given,

Ball,

Mass = 0.5 kg

Height = 10 m

Acceleration due to gravity (a) = 9.8 m/s²

Initial Velocity (u) = 0 m/s

Final Velocity (v) = Let it be v.

= v² = u²+2aS

= v² = 2*9.8*10

= v² = 196 m/s

= v = 14 m/s

Now, taking the height as 5 m,

= v² = u²+2aS

= v² = 2*9.8*5

= v² = 98 m/s

K.E = 1/2m*v²

= [0.5*0.5*98] J

= 24.5 J

Hope this helps.