19. A bullet moving with 10m/s hit the wooden plank. The bullets stops when penetrates
2 cm deep. Calculate the retardation of bullet
20. A stone thrown vertically upwards with a speed of 5 m/s. How much high the stone goes
before back to the earth? A=-9.8m/s2
21. A car starts from rest and moves along the x-axis with constant acceleration 5 m/s2 for
8 seconds. If it then continues with constant velocity, what distance will the car cover in
12 seconds since it started from the rest?
22. A motorcyclist drives from A to B with a uniform speed of 30 km/h and returns back
with a speed of 20 km/h. Find its average speed.
23. Draw a velocity versus time graph of a stone thrown vertically upwards and then coming
downwards after attaining the maximum height.
24. The velocity-time graph (see below Figure) shows the motion of
a cyclist. Find (i) its acceleration (ii) its velocity and (iii) the
distance covered by the cyclist in 15 seconds
25. An electron moving with a velocity of 5 × 104 m/s enters into a
uniform electric field and acquires a uniform
acceleration of 104 m/s2
in the direction of its initial motion.
26. (i) Calculate the time in which the electron would acquire a velocity double of its initial
velocity.
(ii) How much distance the electron would cover in this time
27. A girl walks along a straight path to drop a letter in the
letterbox and comes back to her initial position. Her
displacement–time graph is shown in below figure. Plot a
velocity– time graph for the same.
28. (a) The velocity-time graph of a car is given below. The car
weighs 1000 kg.
(i) What is the distance travelled by the car in the first
2 seconds?
(ii) What is the braking force at the end of 5 seconds
to bring the car to a stop within one second?
29. The V-T graph of cars A and B which start from the
same place and move along a straight road in the
same direction, is shown. Calculate
(i) the acceleration of car A between 0 and 8 s.
(ii) the acceleration of car B between 2 s and 4 s.
(iii) the points of time at which both the cars have the
same velocity
(iv) which of the two cars is ahead after 8 sec. and by
how much?
30. A car is running at a speed of 54 km h–1
. In the next
second, its speed is 63 km h–1
. Calculate the distance
covered by the car in m.
Answers
Answered by
2
19 -2500m/s^2
20 1.27m
21. 320m
22. 24km/hr
24
25 what to find in this
26 5 sec
ii 3.75× 10^5
27
30 16.25m
some graphs you have not given
graph plotting I will give you tonight
20 1.27m
21. 320m
22. 24km/hr
24
25 what to find in this
26 5 sec
ii 3.75× 10^5
27
30 16.25m
some graphs you have not given
graph plotting I will give you tonight
sabrina789:
thank u and sorry
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