JEE Main 2022 (Online) 29th June Morning Shift | Motion Question 80 | Physics

Two balls A and B are placed at the top of 180 m tall tower. Ball A is released from the top at t = 0 s. Ball B is thrown vertically down with an initial velocity 'u' at t = 2 s. After a certain time, both balls meet 100 m above the ground. Find the value of 'u' in ms^$$-$$1. [use g = 10 ms^$$-$$2] :

JEE Main 2022 (Online) 28th June Evening Shift

MCQ (Single Correct Answer)

-1

Velocity (v) and acceleration (a) in two systems of units 1 and 2 are related as $${v_2} = {n \over {{m^2}}}{v_1}$$ and $${a_2} = {{{a_1}} \over {mn}}$$ respectively. Here m and n are constants. The relations for distance and time in two systems respectively are :

$${{{n^3}} \over {{m^3}}}{L_1} = {L_2}$$ and $${{{n^2}} \over m}{T_1} = {T_2}$$

$${L_1} = {{{n^4}} \over {{m^2}}}{L_2}$$ and $${T_1} = {{{n^2}} \over m}{T_2}$$

$${L_1} = {{{n^2}} \over m}{L_2}$$ and $${T_1} = {{{n^4}} \over {{m^2}}}{T_2}$$

$${{{n^2}} \over m}{L_1} = {L_2}$$ and $${{{n^4}} \over {{m^2}}}{T_1} = {T_2}$$

JEE Main 2022 (Online) 27th June Morning Shift

MCQ (Single Correct Answer)

-1

A projectile is launched at an angle '$$\alpha$$' with the horizontal with a velocity 20 ms^$$-$$1. After 10 s, its inclination with horizontal is '$$\beta$$'. The value of tan$$\beta$$ will be : (g = 10 ms^$$-$$2).

tan$$\alpha$$ + 5sec$$\alpha$$

tan$$\alpha$$ $$-$$ 5sec$$\alpha$$

2tan$$\alpha$$ $$-$$ 5sec$$\alpha$$

2tan$$\alpha$$ $$+$$ 5sec$$\alpha$$

JEE Main 2022 (Online) 27th June Morning Shift

MCQ (Single Correct Answer)

-1

A girl standing on road holds her umbrella at 45$$^\circ$$ with the vertical to keep the rain away. If she starts running without umbrella with a speed of 15$$\sqrt2$$ kmh^$$-$$1, the rain drops hit her head vertically. The speed of rain drops with respect to the moving girl is :

30 kmh^$$-$$1

$${{25} \over {\sqrt 2 }}$$ kmh^$$-$$1

$${{30} \over {\sqrt 2 }}$$ kmh^$$-$$1

25 kmh^$$-$$1

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Questions Asked from Motion (MCQ (Single Correct Answer))

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