Physics · May / June 2022 · Paper 41 · Question 1
0625
As printed in the paper
The question as text
A car of mass m is travelling along a straight, horizontal road at a constant speed v. At time t = 0, the driver of the car sees an obstruction in the road ahead of the car and applies the brakes. The car does not begin to decelerate at t = 0.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
1(a)[2]
negative acceleration or decrease in velocity
change in velocity per unit time or rate of change of velocity
1(b)[1]
delay in applying brakes or (human) reaction time or foot not removed from accelerator
1(c)(i)[1]
gradient or slope
20.5 m / s ⩽ answer ⩽ 23.5 m / s
1(c)(ii)[2]
and (upper) time coordinate ⩽ 1.0 s
the coordinates at one point on curve (e.g. (0.50, 11))
C1
1(d)(i)[1]
air resistance / air friction acts on the car
1(d)(ii)[2]
air resistance / resultant / resistive force decreases
and as speed decreases / car decelerates
air resistance / resultant / resistive force decreases / changes
C1
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