1
JEE Main 2021 (Online) 20th July Evening Shift
+4
-1
A boy reaches the airport and finds that the escalator is not working. He walks up the stationary escalator in time t1. If he remains stationary on a moving escalator then the escalator takes him up in time t2. The time taken by him to walk up on the moving escalator will be :
A
$${{{t_1}{t_2}} \over {{t_2} - {t_1}}}$$
B
$${{{t_1} + {t_2}} \over 2}$$
C
$${{{t_1}{t_2}} \over {{t_2} + {t_1}}}$$
D
$${t_2} - {t_1}$$
2
JEE Main 2021 (Online) 20th July Morning Shift
+4
-1
A butterfly is flying with a velocity $$4\sqrt 2$$ m/s in North-East direction. Wind is slowly blowing at 1 m/s from North to South. The resultant displacement of the butterfly in 3 seconds is :
A
$$12\sqrt 2$$ m
B
20 m
C
3 m
D
15 m
3
JEE Main 2021 (Online) 18th March Evening Shift
+4
-1
The velocity $$-$$ displacement graph of a particle is shown in the figure.

The acceleration $$-$$ displacement graph of the same particle is represented by :
A
B
C
D
4
JEE Main 2021 (Online) 18th March Morning Shift
+4
-1
The position, velocity and acceleration of a particle moving with a constant acceleration can be represented by :
A
B
C
D
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