Motion in A Straight Line Test

Result

Motion in A Straight Line Test - 6

Score
-
out of -
Rank
-
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TIME Taken - -

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Question 1
1 / -0

A stone thrown from the top of a building is given an initial velocity of 20.0 m/s straight upward. Determine the time in seconds at which the stone reaches its maximum height. g =9.8 m / sec²

A
2.7

B
1.67

C
2.04

D
2.8

Solution

Initial velocity u = 20.0 m/s

At maximum height it ll stop

So final velocity v = 0 m/s

Acceleration due to gravity g = 9.8 m/s²

Time taken to reach maximum height = t

We know

v = u + at

=> 0 = 20+(−9.8)t

=>t = −20 / −9.8 = 2.04 s [g is taken negative because it is in opposite direction of motion.]
Question 2
1 / -0

Motion along a straight line is called __________.

A
circular motion

B
parabolic motion

C
rectilinear motion

D
oscillatory motion

Solution

Rectilinear motion is another name for straight-line motion. This type of motion describes the movement of a particle or a body. A body is said to experience rectilinear motion if any two particles of the body travel the same distance along two parallel straight lines.
Question 3
1 / -0

A jet lands on an aircraft carrier at 60 m/s. What is its acceleration if it stops in 2.0 s?

A
-30 ms⁻²

B
-10 ms⁻²

C
-20 ms⁻²

D
30 ms⁻²

Solution

Initial velocity u = 60 m/s

As it stops then final velocity v = 0 m/s

Time taken t = 2.0 s

We know,

v-u = at

=> 0-60= 2a

=> a = −60/2 =−30 m/s²

-ve sign shows velocity is decreasing.