Ch-02 Kinematics: Daily Practice Problem 06
Ch-02 Kinematics: Daily Practice Problem 06
Ch-02 Kinematics: Daily Practice Problem 06
Ch—02 Kinematics
Daily Practice Problem 06
(c) 20 min
�𝑣𝑣12 −𝑣𝑣22 �
(b) 𝑡𝑡1 =
2
Q3. A boat is sent across a river with a (c) 𝑛𝑛𝑛𝑛𝑛𝑛𝑛𝑛
velocity of 8 𝑘𝑘𝑘𝑘/ℎ𝑟𝑟. If the resultant velocity
of boat is 10 𝑘𝑘𝑘𝑘/ℎ𝑟𝑟, then velocity of the river (d) Both
is: [Pb. PET 2004]
(a) 10 km/hr
Q6. It takes one minute for a passenger
(b) 8 km/hr standing on an escalator to reach the top. If
the escalator does not move it takes him 3
(c) 6 km/hr
minute to walk up. How long will it take for the
Kinematics 2
passenger to arrive at the top if he walks up Q10. On a long horizontally moving belt, a
the moving escalator? child runs to and fro with a speed 9 𝑘𝑘𝑘𝑘ℎ−1
(with respect to the belt) between his father
(a) 30 sec
and mother located 50 m apart on the moving
(b) 45 sec belt. The belt moves with the speed of
4 𝑘𝑘𝑘𝑘ℎ−1 . For an observer on a stationary
(c) 40 sec
platform, the speed of the child running in the
(d) 35 sec direction of motion of the belt is:
(a) 4 𝑘𝑘𝑘𝑘ℎ−1
(c) 3 𝑘𝑘𝑘𝑘ℎ−1
Q17. A river is flowing from east to west at a
(d) 1 𝑘𝑘𝑘𝑘ℎ −1
speed of 5 m/min. A man on south bank of
river, capable of swimming 10m/min in still
water, wants to swim across the river in
Q14. A boat is rowed across a river at the shortest time. He should swim
rate of 4.5 𝑘𝑘𝑘𝑘/ℎ𝑟𝑟. The river flows at the rate (a) Due north
of 6 𝑘𝑘𝑘𝑘/ℎ𝑟𝑟. The velocity of boat in 𝑚𝑚/𝑠𝑠 is:
(b) Due north-east
(a) 3.1
(c) Due north-east with double the speed of
(b) 2.1 river
(c) 2.9 (d) None of these 4.
(d) 5.
Q19. A boat crosses a river with a velocity of the water in the river. The velocity of the
8 km/h. If the resulting velocity of boat is 10 water current in km/hr is
km/h then the velocity of river water is
(a) 1
(a) 4 km/h
(b) 2
(b) 6 km/h 1
(c)
(c) 8 km/h 2
3
(d) 10 km/h (d)
2
ANSWERS
1. b 8. 50 m 16. b
17. a
2. a 1
9. 𝑡𝑡𝑡𝑡𝑛𝑛−1 � �
3
18. c
3. c
10. d
19. b
4. d 11. a
20. a
5. a 12. b
13. a`
6. b
14. b
7. a
15. b