1
JEE Main 2020 (Online) 6th September Evening Slot
+4
-1
When a car is at rest, its driver sees rain drops falling on it vertically. When driving the car with speed v, he sees that rain drops are coming at an angle 60° from the horizontal. On further increasing the speed of the car to (1 + $$\beta$$)v, this angle changes to 45o. The value of $$\beta$$ is close to :
A
0.50
B
0.73
C
0.37
D
0.41
2
JEE Main 2020 (Online) 5th September Evening Slot
+4
-1
The velocity (v) and time (t) graph of a body in a straight line motion is shown in the figure. The point S is at 4.333 seconds. The total distance covered by the body in 6 s is :
A
12 m
B
11 m
C
$${{49} \over 4}$$ m
D
$${{37} \over 3}$$ m
3
JEE Main 2020 (Online) 5th September Morning Slot
+4
-1
A helicopter rises from rest on the ground vertically upwards with a constant acceleration g. A food packet is dropped from the helicopter when it is at a height h. The time taken by the packet to reach the ground is close to :
[g is the acceleration due to gravity]
A
t = 3.4$$\sqrt {\left( {{h \over g}} \right)}$$
B
t = 1.8$$\sqrt {\left( {{h \over g}} \right)}$$
C
t = $$\sqrt {{{2h} \over {3g}}}$$
D
t = $${2 \over 3}\sqrt {\left( {{h \over g}} \right)}$$
4
JEE Main 2020 (Online) 5th September Morning Slot
+4
-1
A balloon is moving up in air vertically above a point A on the ground. When it is at a height h1, a girl standing at a distanced (point B) from A (see figure) sees it at an angle 45o with respect to the vertical. When the balloon climbs up a further height h2, it is seen at an angle 60o with respect to the vertical if the girl moves further by a distance 2.464 d(point C). Then the height h2 is (given tan 30o = 0.5774)
A
0.464d
B
d
C
0.732d
D
1.464d
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