Physics · May / June 2020 · Paper 41 · Question 1
0625
As printed in the paper
The question as text
An aeroplane of mass 2.5 × 105 kg lands with a speed of 62 m / s, on a horizontal runway at time t = 0. The aeroplane decelerates uniformly as it travels along the runway in a straight line until it reaches a speed of 6.0 m / s at t = 35 s.
Read automatically from the paper; the printed page above is exact.
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1(a)(i)[2]
(a =) (v – u) / t OR (62 – 6.0) / 35 OR 56 / 35
1.6 m / s2
1(a)(ii)[2]
(F =) ma OR ∆p / ∆t OR 2.5 × 105 × 1.6 OR (62 × 2.5 × 105 – 6.0 × 2.5 × 105) / 35
4.0 × 105 N
1(a)(iii)[2]
(p =) mv OR 2.5 × 105 × 6.0
1.5 × 106 kg m / s
1(b)[3]
curve of decreasing gradient from (0,0) to a point along dashed line
straight line of positive gradient after t = 35 s
gradient not zero at t = 35 s OR no change of gradient (at t = 35 s)
1(c)[1]
thermal energy AND in something specific (e.g. brakes / air / tyres) OR kinetic energy of air
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