Two balls of masses m1 and m2 are separated from each other by a powder charge placed between them. The whole system is at rest on the ground. Suddenly the powder charge explodes and masses are pushed apart. The mass m1 travels a distance s1 and stops. If the coefficients of friction between the balls and ground are same, the mass m2 stops after travelling the distance

(1) ${s}_{2}=\frac{{m}_{1}}{{m}_{2}}{s}_{1}$

(2) ${s}_{2}=\frac{{m}_{2}}{{m}_{1}}{s}_{1}$

(3) ${s}_{2}=\frac{{m}_{1}^{2}}{{m}_{2}^{2}}{s}_{1}$

(4) ${s}_{2}=\frac{{m}_{2}^{2}}{{m}_{1}^{2}}{s}_{1}$

Concept Questions :-

Newton laws
High Yielding Test Series + Question Bank - NEET 2020

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A force vector applied on a mass is represented as $\stackrel{\to }{F}=6\stackrel{^}{i}-8\stackrel{^}{j}+10\stackrel{^}{k}$ and accelerates with 1 m/s2. What will be the mass of the body

(1) $10\sqrt{2}\text{\hspace{0.17em}}kg$

(2) $2\sqrt{10}\text{\hspace{0.17em}}kg$

(3) 10 kg

(4) 20 kg

Concept Questions :-

Application of laws
High Yielding Test Series + Question Bank - NEET 2020

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A cricket ball of mass 250 g collides with a bat with velocity 10 m/s and returns with the same velocity within 0.01 second. The force acted on bat is

(1) 25 N

(2) 50 N

(3) 250 N

(4) 500 N

Concept Questions :-

Newton laws
High Yielding Test Series + Question Bank - NEET 2020

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A pendulum bob of mass 50 gm is suspended from the ceiling of an elevator. The tension in the string if the elevator goes up with uniform velocity is approximately

(1) 0.30 N

(2) 0.40 N

(3) 0.42 N

(4) 0.50 N

Concept Questions :-

Application of laws
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The average force necessary to stop a bullet of mass 20 g moving with a speed of 250 m/s, as it penetrates into the wood for a distance of 12 cm is

(1) 2.2 × 103 N

(2) 3.2 × 103 N

(3) 4.2 × 103 N

(4) 5.2 × 103 N

Concept Questions :-

Newton laws
High Yielding Test Series + Question Bank - NEET 2020

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A man measures time period of a pendulum (T) in stationary lift. If the lift moves upward with acceleration $\frac{g}{4},$ then new time period will be

(1) $\frac{2T}{\sqrt{5}}$

(2) $\frac{\sqrt{5}T}{2}$

(3) $\frac{\sqrt{5}}{2T}$

(4) $\frac{2}{\sqrt{5}T}$

Concept Questions :-

Application of laws
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

If rope of lift breaks suddenly, the tension exerted by the surface of lift (a = acceleration of lift)

(1) mg

(2) m(g + a)

(3) m(ga)

(4) 0

Concept Questions :-

Types of forces
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A lift of mass 1000 kg is moving with an acceleration of 1 m/s2 in upward direction. Tension developed in the string, which is connected to the lift, is

(1) 9,800 N

(2) 10,000 N

(3) 10,800 N

(4) 11,000 N

Concept Questions :-

Types of forces
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A lift accelerated downward with acceleration 'a'. A man in the lift throws a ball upward with acceleration a0(a0 < a). Then acceleration of ball observed by observer, which is on earth, is

(1) (a + a0) upward

(2) (aa0) upward

(3) (a + a0) downward

(4) (aa0) downward

Concept Questions :-

Application of laws
High Yielding Test Series + Question Bank - NEET 2020

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A lift is moving down with acceleration a. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively

(1) g, g

(2) ga, ga

(3) ga , g

(4) a, g

Concept Questions :-

Application of laws