Equations of uniformly accelerated motion

3 marks · Easy

A skateboarder moves in a straight line. She starts at 3 m/s and accelerates uniformly at 1.5 m/s² for 4 m.

(a)

State the initial speed of the skateboarder.

[1 mark]

(b)

Calculate her final speed after travelling the 4 m.

[2 marks]

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(a) 3 m/s

(b) m/s (to 2 s.f.) m/s

Show mark scheme and worked solution

Marking points

B1 (a) · 1 mark · Correct initial speed stated: 3 m/s

M1 (b) · 1 mark · Correct substitution into formula with all values

A1 (b) · 1 mark · Correct calculation: m/s (allow 4.74 or better)

Worked solution

a) Initial speed is given as 3 m/s.

b) Use:

To 2 s.f., final speed = 4.7 m/s.