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#28-Sign Convention

(Physics) > Motion in A Straight Line

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Related Practice Questions :

A ball is thrown upward with a certain speed. It passes through the same point at 3 second and 7 second from the start. The maximum height achieved by the ball is

1. 500 m

2. 250 m

3. 125 m

4. 450 m

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A stone falls freely from rest from a height h and it travels a distance $\frac{9h}{25}$ in the last second. The value of h is:

1. 145 m

2. 100 m

3. 122.5 m

4. 200 ms

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A bullet loses $\frac{1}{20}$ of its velocity passing through a plank. The least number of planks required to stop the bullet is (All planks offers same retardation)

(1) 10

(2) 11

(3) 12

(4) 23

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A point moves with uniform acceleration and *v*_{1}, *v*_{2} and *v*_{3} denote the average velocities in the three successive intervals of time *t*_{1}, *t*_{2} and *t*_{3}. Which of the following relations is correct ?

(1) $({v}_{1}-{v}_{2}):({v}_{2}-{v}_{3})=({t}_{1}-{t}_{2}):({t}_{2}+{t}_{3})$

(2) $({v}_{1}-{v}_{2}):({v}_{2}-{v}_{3})=({t}_{1}+{t}_{2}):({t}_{2}+{t}_{3})$

(3) $({v}_{1}-{v}_{2}):({v}_{2}-{v}_{3})=({t}_{1}-{t}_{2}):({t}_{1}-{t}_{3})$

(4) $({v}_{1}-{v}_{2}):({v}_{2}-{v}_{3})=({t}_{1}-{t}_{2}):({t}_{2}-{t}_{3})$

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The initial velocity of the particle is 10 m/sec and its retardation is 2 m/sec^{2}. The distance moved by the particle in 5^{th} second of its motion is

(1) 1 m

(2) 19 m

(3) 50 m

(4) 75 m

PMT - 1976

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Difficulty Level: