A cricketer throws a ball of mass 200 g high up in the air to height of 10 m. Class 9

A cricketer throws a ball of mass 200 g high up in the air to height of 10 m. Class 9

Question 1.

A cricketer throws a ball of mass 200 g high up in the air to height of 10 m, above the ground. How much potential energy does ball have when ball reaches its maximum height? Class 9

Answer:

Potential energy is U = mgh = 0.2 × 9.8 × 10 = 19.6 J

Question 2.

What is the magnitude of velocity of child on reaching the bottom of slide of height h ? Class 9

Answer:

Potential energy at height h = mgh

Kinetic energy at the bottom of slide = 1/2 mv²

Potential energy at height h = Kinetic energy at the bottom of slide

mgh = 1/2 mv²; v = [latex]\sqrt{2 g h}[/latex]