# Solve this question

Solve this question 5.
Complete the following table.
u (rn/s)
-g
s)
4. Complete the sentences and explain
a. The minimum distance between
the start and finish points of the
motipn of an object is called the
of the object.
b. Deceleration is
acceleration
c. When an object is in uniform
circular motion, its
changes at every point.
d. During collision .
remains
constant.
e. The working oc a rocket depends
on Newton's .
law of motion.
Give scientific reasons.
2
t (sec)
7. Solve the following examples.
a)
b)
c)
d)
An object moves 18 m in the first
3 s, 22 m in the next 3 s and 14 m in
the last 3 s. What is its average
speed?
(Ans: 6 m/s)
An object of mass 16 kg is moving
with un acceleration of 3 m/s:
Calculate the applied force. If the
same force is applied on an object of
mass 24 kg, how much will be the
acceleration? (Ans: 48 N, 2 m/s2)
A bullet having u muss of 10 g and
moving with a speed of 1.5 mis,
penetrates a thick wooden plunk of
mass 90 g. The plank was initially
at rest. The bullet gets embedded in
the plank and both move together.
Determine their velocity.
(Ans: 0.15 m/s)
A person swims 100 m in the first
40 s, 80 m in the next 40 s and 45 m
20 s. What is the average
in the
speed?
(Ans: 2.25 m/s2)
6.
a. When an object falls freely to the
ground, its acceleration is uniform.
b. Even though the magnitudes of
action force and reaction force are
equal and their directions are
opposite, their effects do not get
cancelled.
c. It is easier to stop a tennis ball as
compared to a cricket ball, when
both are travelling with the same
velocity.
d. The velocity of an object at rest is
considered to be uniform.
Take 5 examples from your
surroundings and give explanation
based on Newtons laws of motion.
Project:
Obtain information about
commonly used gadgets or devices
which are based on the principles
Of Newton's laws of motion.