1. A ball of mass 5.00 kg is dropped from 20.0 m above the ground. a.)Neglecting

Question

1. A ball of mass 5.00 kg is dropped from 20.0 m above the ground. a.)Neglecting air resistance, determine the speed of the ball when it is at a height of 7.00 m above the ground b.) Determine the speed of the ball when it hits the ground c.) Determine the speed of the ball at 7.00 m if the ball was thrown with an initial velocity of 2.50 m/s 1. A ball of mass 5.00 kg is dropped from 20.0 m above the ground. a.)Neglecting air resistance, determine the speed of the ball when it is at a height of 7.00 m above the ground b.) Determine the speed of the ball when it hits the ground c.) Determine the speed of the ball at 7.00 m if the ball was thrown with an initial velocity of 2.50 m/s 1. A ball of mass 5.00 kg is dropped from 20.0 m above the ground. a.)Neglecting air resistance, determine the speed of the ball when it is at a height of 7.00 m above the ground b.) Determine the speed of the ball when it hits the ground c.) Determine the speed of the ball at 7.00 m if the ball was thrown with an initial velocity of 2.50 m/s

Explanation / Answer

part a )

v^2 = u^2 + 2gs

u = 0 here ball is dropped

s = 13 m

v = sqrt(2*9.8*13)

v = 15.96 m/s

part b )

in this part s = 20 m

v = sqrt(2gs)

v = sqrt(2*9.8*20)

v = 19.8 m/s

part c )

u = 2.50 m/s

s = 13

v^2 = u^2 + 2gs

v^2 = (2.5)^2 + 2*9.8*13

v = 16.16 m/s

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