1
JEE Main 2022 (Online) 29th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A particle of mass 500 gm is moving in a straight line with velocity v = b x5/2. The work done by the net force during its displacement from x = 0 to x = 4 m is : (Take b = 0.25 m$$-$$3/2 s$$-$$1).

A
2 J
B
4 J
C
8 J
D
16 J
2
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Arrange the four graphs in descending order of total work done; where W1, W2, W3 and W4 are the work done corresponding to figure a, b, c and d respectively.

JEE Main 2022 (Online) 26th June Evening Shift Physics - Work Power & Energy Question 69 English 1 JEE Main 2022 (Online) 26th June Evening Shift Physics - Work Power & Energy Question 69 English 2

JEE Main 2022 (Online) 26th June Evening Shift Physics - Work Power & Energy Question 69 English 3

JEE Main 2022 (Online) 26th June Evening Shift Physics - Work Power & Energy Question 69 English 4

A
W3 > W2 > W1 > W4
B
W3 > W2 > W4 > W1
C
W2 > W3 > W4 > W1
D
W2 > W3 > W1 > W4
3
JEE Main 2022 (Online) 24th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A particle experiences a variable force $$\overrightarrow F = \left( {4x\widehat i + 3{y^2}\widehat j} \right)$$ in a horizontal x-y plane. Assume distance in meters and force is newton. If the particle moves from point (1, 2) to point (2, 3) in the x-y plane, then Kinetic Energy changes by :

A
50.0 J
B
12.5 J
C
25.0 J
D
0 J
4
JEE Main 2021 (Online) 1st September Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A body of mass 'm' dropped from a height 'h' reaches the ground with a speed of 0.8$$\sqrt {gh} $$. The value of workdone by the air-friction is :
A
$$-$$0.68 mgh
B
mgh
C
1.64 mgh
D
0.64 mgh
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