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Assume that all questions take place chose to surface of earth

gravity = 10n/kg

1) a 57g tennis ball is dropped from a height of 90cm

a) What is the gravitational potential energy of the tennis ball before it is dropped?

b) What is the kinetic energy of the ball as it lands?

c) What is the vertical speed of the ball as it lands on the ground?

Help of any kind would be appreciated