A ball is dropped from rest from a hot air balloon. It hits the ground 15 seconds later.

a. Calculate the speed with which it hits the ground.

i. V = U + AT

V = 0 + 9.8*15

V = 147 m/s

b. Find the height from which the ball was dropped.

i. S = 0.5(U + V)T^2

S = 0.5(147)15^2

S = 16537.5

ii. V^2 = U^2 + 2AS

S = 1102.5 metres

Answer a is fully correct but only ii is correct for b. I really want to know why the first one didn’t work. I genuinely can't see what I've done wrong and I want to know how I can prevent this happening during a test.

a. Calculate the speed with which it hits the ground.

i. V = U + AT

V = 0 + 9.8*15

V = 147 m/s

b. Find the height from which the ball was dropped.

i. S = 0.5(U + V)T^2

S = 0.5(147)15^2

S = 16537.5

ii. V^2 = U^2 + 2AS

S = 1102.5 metres

Answer a is fully correct but only ii is correct for b. I really want to know why the first one didn’t work. I genuinely can't see what I've done wrong and I want to know how I can prevent this happening during a test.

Original post by honey_mgw

A ball is dropped from rest from a hot air balloon. It hits the ground 15 seconds later.

a. Calculate the speed with which it hits the ground.

i. V = U + AT

V = 0 + 9.8*15

V = 147 m/s

b. Find the height from which the ball was dropped.

i. S = 0.5(U + V)T^2

S = 0.5(147)15^2

S = 16537.5

ii. V^2 = U^2 + 2AS

S = 1102.5 metres

Answer a is fully correct but only ii is correct for b. I really want to know why the first one didn’t work. I genuinely can't see what I've done wrong and I want to know how I can prevent this happening during a test.

a. Calculate the speed with which it hits the ground.

i. V = U + AT

V = 0 + 9.8*15

V = 147 m/s

b. Find the height from which the ball was dropped.

i. S = 0.5(U + V)T^2

S = 0.5(147)15^2

S = 16537.5

ii. V^2 = U^2 + 2AS

S = 1102.5 metres

Answer a is fully correct but only ii is correct for b. I really want to know why the first one didn’t work. I genuinely can't see what I've done wrong and I want to know how I can prevent this happening during a test.

For b i, you squared 15 but you’re not supposed to. If you don’t square 15 you get 1102.5m

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