MHT CET 2020 19th October Evening Shift | Center of Mass and Collision Question 24 | Physics

$N$ number of balls of mass $m \mathrm{~kg}$ moving along positive direction of $X$ - axis, strike a wall per second and return elastically. The velocity of each ball is $u \mathrm{~m} / \mathrm{s}$. The force exerted on the wall by the balls in newton, is

$2 m N u$

$\frac{m N u}{2}$

$m N u$

MHT CET 2020 16th October Evening Shift

MCQ (Single Correct Answer)

-0

A batsman hits a ball of mass 0.2 kg straight towards the bowler without changing its initial speed of $$6 \mathrm{~m} / \mathrm{s}$$. What is the impulse imparted to the ball?

3.2 N-s

1.6 N-s

4 N-s

2.4 N-s

MHT CET 2020 16th October Morning Shift

MCQ (Single Correct Answer)

-0

A bullet of mass $$m$$ moving with velocity $$v$$ is fired into a wooden block of mass $$M$$, If the bullet remains embedded in the block, the final velocity of the system is

$$\frac{m+M}{m}$$

$$\frac{M+m}{m v}$$

$$\frac{m v}{m+M}$$

$$\frac{v}{m(M+m)}$$

MHT CET 2019 2nd May Evening Shift

MCQ (Single Correct Answer)

-0

A block of mass ' $m$ ' moving on a frictionless surface at speed ' $v$ ' collides elastically with a block of same mass, initially at rest. Now the first block moves at an angle ' $\theta$ ' with its initial direction and has speed ' $v_1$ '. The speed of the second block after collision is

$\sqrt{v_1^2-v^2}$

$\sqrt{v^2-v_1^2}$

$\sqrt{v^2+v_1^2}$

$\sqrt{v-v_1}$

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