Title College Physics 10th Edition Young Test Bank Speed Velocity Acceleration Rocket 342.2 KB 13
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15) A racing car accelerates unif15) A racing car accelerates uniformly from rest ormly from rest along a straight track. along a straight track. This track has markersThis track has markers
spaced at equal distances along it spaced at equal distances along it from the start, as from the start, as shown in Figure 2.2. shown in Figure 2.2. The car reaches a speedThe car reaches a speed
of 140 km/h as it passes marker 2.of 140 km/h as it passes marker 2.

Figure 2.2Figure 2.2

Whereabouts on the track was the car when it was travelling at half this speed, i.e. at 70 km/h?Whereabouts on the track was the car when it was travelling at half this speed, i.e. at 70 km/h?
A) Before marker 1A) Before marker 1
B) At marker 1B) At marker 1
C) Between marker 1 and marker 2C) Between marker 1 and marker 2

Var: 1Var: 1

16) A stone is thrown vertically upwards, reaches 16) A stone is thrown vertically upwards, reaches a highest point, and returns to a highest point, and returns to the ground.the ground.
When the stone is at theWhen the stone is at the toptop of its path, its acceleration of its path, its acceleration
A) is zero.A) is zero.
B) is directed upwards.B) is directed upwards.
C) is directed downwards.C) is directed downwards.
D) changes direction from upwards to downwardD) changes direction from upwards to downwards.s.