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A body is projected at t=0 with a velocity 10 m s-1 at an angle of 60° with the horizontal. The radius of curvature of its trajectory at t=1 s is R. Neglecting air resistance and taking acceleration due to gravity g=10 m s-2, the value of R is

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Important Questions on Projectile Motion

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JEE Main
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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 4 - Projectile Motion>Excercise 1>Q 8
A projectile is thrown in the upward direction making an angle of 60° with the horizontal with a velocity of 140 m s-1. Then the time after which its velocity makes an angle 45° with the horizontal is (Acceleration due to gravity, g=10 m s-2)
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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 4 - Projectile Motion>Excercise 1>Q 9

A rough inclined plane BCE of height 256 m is kept on a rectangular wooden block ABCD of height 10 m, as shown in the figure. A small block is allowed to slide down from the top E of the inclined plane. The coefficient of kinetic friction between the block and the inclined plane is 18 and the angle of inclination of the inclined plane is sin-10.6. If the small block finally reaches the ground at a point F, then DF will be (Acceleration due to gravity, g=10 m s-2)

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IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 4 - Projectile Motion>Excercise 1>Q 10
Two boys conducted experiments on the projectile motion with a stopwatch and noted some readings. As one boy throws a stone in the air at the same angle as the horizontal, the other boy observes that after 4 s, the stone is moving at an angle 30° to the horizontal and after another, 2 s it is traveling horizontally. The magnitude of the initial velocity of the stone is (Acceleration due to gravity, g=10 m s-2)
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JEE Main
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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 4 - Projectile Motion>Excercise 1>Q 11
A ball is projected vertically up from the ground. The boy A standing at the window of the first floor of a nearby building observes that the time interval between the ball crossing him while going up and the ball crossing him while going down is 2 s. Another boy B standing on the second floor notices that time interval between the ball passing him twice, during up motion and down motion is 1 s. Calculate the difference between the vertical positions of boy B and boy A (Assume, acceleration due to gravity, g=10 m s-2)
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JEE Main
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 4 - Projectile Motion>Excercise 1>Q 12
Two particles are simultaneously projected in the horizontal direction from a point P at a certain height. The initial velocities of the particles are oppositely directed to each other and have magnitude v each. The separation between the particles at a time when their position vectors (drawn from the point P) are mutually perpendicular, is