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1(a)
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Question 1

1(a)

A tangent to the curve at 50 s is shown. Calculate the speed of the robot at 50 s.
[2 marks]
Black-and-white Higher-tier distance-time graph for a delivery robot. It is stationary at eighty metres from twenty to thirty-five seconds, then follows a curve. A tangent at fifty seconds passes through forty seconds and one hundred metres, and sixty seconds and one hundred and eighty metres.
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Spec: 4.5.6.1.2, 4.5.6.1.4
Reasoning

1(b)

Describe the motion of the robot between 20 s and 35 s. Use the graph in your answer.
[2 marks]
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Spec: 4.5.6.1.4
Reasoning

1(c)

Later, the robot travels a further 360 m at a constant speed of 4.0 m s⁻¹. Calculate the time taken.
[3 marks]
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Spec: 4.5.6.1.2
Reasoning

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