1
JEE Main 2019 (Online) 9th April Morning Slot
+4
-1
A body of mass 2 kg makes an eleastic collision with a second body at rest and continues to move in the original direction but with one fourth of its original speed. What is the mass of the second body ?
A
1.2 kg
B
1.0 kg
C
1.8 kg
D
1.5 kg
2
JEE Main 2019 (Online) 9th April Morning Slot
+4
-1
A ball is thrown vertically up (taken as +z-axis) from the ground. The correct momentum-height (p-h) diagram is :
A
B
C
D
3
JEE Main 2019 (Online) 8th April Evening Slot
+4
-1
A uniform rectangular thin sheet ABCD of mass M has length a and breadth b, as shown in the figure. If the shaded portion HBGO is cut-off, the coordinates of the centre of mass of the remaining portion will be :-
A
$$\left( {{{5a} \over 3},{{5b} \over 3}} \right)$$
B
$$\left( {{{2a} \over 3},{{2b} \over 3}} \right)$$
C
$$\left( {{{5a} \over 12},{{5b} \over 12}} \right)$$
D
$$\left( {{{3a} \over 4},{{3b} \over 4}} \right)$$
4
JEE Main 2019 (Online) 8th April Evening Slot
+4
-1
A body of mass m1 moving with an unknown velocity of $${v_1}\mathop i\limits^ \wedge$$, undergoes a collinear collision with a body of mass m2 moving with a velocity $${v_2}\mathop i\limits^ \wedge$$ . After collision, m1 and m2 move with velocities of $${v_3}\mathop i\limits^ \wedge$$ and $${v_4}\mathop i\limits^ \wedge$$ , respectively. If m2 = 0.5 m1 and v3 = 0.5 v1, then v1 is :-
A
$${v_4} - {{{v_2}} \over 2}$$
B
$${v_4} - {{{v_2}} \over 4}$$
C
$${v_4} - {v_2}$$
D
$${v_4} + {v_2}$$
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