A car starts from rest and accelerates at 5 m/s2. At t = 4s, a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at t = 6 s?

(Take g = 10 m/s2)

1. 202 m/s,  m/s2

2. 202 m/s, 10 m/s2

3. 20 m/s, 5 m/s2

4. 20 m/s, 0

Subtopic:  Projectile Motion |
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A particle moving in a circle of radius R with a uniform speed takes a time T to complete one revolution. If this particle were projected with the same speed at an angle 'θ' to the horizontal, the maximum height attained by it equals 4R. The angle of projection, θ, is then given by:

1. θ=sin-1π2RgT21/2

2. θ=sin-12gT2π2R1/2

3. θ=cos-1gT2π2R1/2

4. θ=cos-1π2RgT21/2

Subtopic:  Projectile Motion |
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A ball is projected with a velocity of 10 ms-1 at an angle of 60° with the vertical direction. Its speed at the highest point of its trajectory will be:
1.  \(10\) ms-1
2.  zero
3.  \(5\sqrt3\) ms-1
4.  \(5\) ms-1
Subtopic:  Projectile Motion |
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A cricket ball is thrown by a player at a speed of 20 m/s in a direction 30° above the horizontal. The maximum height attained by the ball during its motion is: (g = 10 m/s2)
1.  5 m
2.  10 m
3.  20 m
4.  25 m
Subtopic:  Projectile Motion |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology