Question 3.3: Additional Answer Options

Option 4 marking criteria:

• ⁽¹⁾ Formula Δ_yC = v_iΔt + 1⁄2aΔt².
• ⁽²⁾ Substitute to calculate ΔyB.
• ⁽³⁾ Substitute to calculate ΔyC.
• ⁽⁴⁾ Substitute Δt = 0,5.
• ⁽⁵⁾ Equating yB and yC.
• ⁽⁶⁾ Final answer: 1,71 s.

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Or

Option 2

Upwards as positive:

⁽¹⁾

⁽²⁾

 

⁽³⁾

⁽⁴⁾

 

ΔyC in terms of:

Equate the 2 equations:

⁽⁵⁾

⁽⁶⁾

---

Or

Downwards as positive:

⁽¹⁾

⁽²⁾

^{(3 + 4)}

Δy_C in terms of Δy_B:

Equate both equations:

⁽⁵⁾

⁽⁶⁾

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Or

Option 3

Upwards as positive:

⁽¹⁾

^{(2 + 3)}

⁽⁴⁾

Δy_C in terms of Δy_B:

Equate the 2 equations:

⁽⁵⁾

⁽⁶⁾

---

Or

Downwards as positive:

⁽¹⁾

^{(2 + 3)}

⁽⁴⁾

Δy_C in terms of Δy_B:

Equate the 2 equations:

⁽⁵⁾

⁽⁶⁾

---

Or

Option 4

Upwards as positive:

Displacement of C after 0,5s:

⁽¹⁾

⁽²⁾

Velocity of C after 0,5 s:

Displacement of C at meeting point:

⁽³⁾

Displacement of B at meeting point:

⁽⁴⁾

At meeting point:

⁽⁵⁾

⁽⁶⁾

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Or

Downwards as positive:

Displacement of C after 0,5 s:

⁽¹⁾

⁽²⁾

Velocity of C after 0,5 s:

Displacement of C at meeting point:

⁽³⁾

Displacement of B at meeting point:

⁽⁴⁾

At meeting point:

⁽⁵⁾

⁽⁶⁾