1
JEE Main 2021 (Online) 25th July Evening Shift
Numerical
+4
-1
Change Language
If the co-efficient of x7 and x8 in the expansion of $${\left( {2 + {x \over 3}} \right)^n}$$ are equal, then the value of n is equal to _____________.
Your input ____
2
JEE Main 2021 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The relation between time t and distance x for a moving body is given as t = mx2 + nx, where m and n are constants. The retardation of the motion is : (When v stands for velocity)
A
2 mv3
B
2 mnv3
C
2nv3
D
2n2v3
3
JEE Main 2021 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In a simple harmonic oscillation, what fraction of total mechanical energy is in the form of kinetic energy, when the particle is midway between mean and extreme position.
A
$${1 \over 2}$$
B
$${3 \over 4}$$
C
$${1 \over 3}$$
D
$${1 \over 4}$$
4
JEE Main 2021 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A force $$\overrightarrow F = (40\widehat i + 10\widehat j)N$$ acts on a body of mass 5 kg. If the body starts from rest, its position vector $$\overrightarrow r $$ at time t = 10 s, will be :
A
$$(100\widehat i + 400\widehat j)m$$
B
$$(100\widehat i + 100\widehat j)m$$
C
$$(400\widehat i + 100\widehat j)m$$
D
$$(400\widehat i + 400\widehat j)m$$
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