Question

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.

Answer 1

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