A police van moving on a highway with a speed of
30 km h–1 fires a bullet at a thief’s car speeding away in
the same direction with a speed of 192 km h–1. If the muzzle
speed of the bullet is 150 m s–1, with what speed does the
bullet hit the thief’s car ? (Note: Obtain that speed which
is relevant for damaging the thief’s car).
Five switches control five lights. Each switch corresponds to one light. How can you figure out which switch controls which light?
4. A bat costs $1 more than a ball. Together, they cost $1.10. What’s the ball’s cost?
A) $0.05
B) $0.10
C) $0.15
Figure 2.11shows the x-t plot of one-
dimensional motion of a particle. Is it correct
to say from the graph that the particle moves
in a straight line for t < 0 and on a parabolic
path for t >0 ? If not, suggest a suitable physical
context for this graph.
3. You have 8 coins, one of which is counterfeit. How can you find the counterfeit coin in 2 weighings?
A) Divide and weigh
B) Weigh 3-3-2
C) Weigh 4-4
2. Which statement is logically equivalent to “No A are B”?
A) All A are not B
B) Some A are not B
C) All B are not A
Look at the graphs (a) to (d) (Fig. 2.10) carefully
and state, with reasons, which of these cannot
possibly represent one-dimensional motion of
a particle.
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