A ball is dropped from the top of a 10 m high building. If the initial speed of the ball is zero, then what its speed after 2 sec(assume constant acceleration of 10m/s² towards the surface of the Earth for any object falling near its surface)

20 m/s

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30 m/s

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25 m/s

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20 m/s²

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Solution

The correct option is A
20 m/s

From the equation of motion,

v = u + a t

where,

v = final velocity

u = initial velocity (0 in this case)

a = acceleration (here acceleration due to gravity 10 m/ $s^{2}$ ), t = time

Velocity = 0 + 10 x 2

= 20 m/s

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A ball is dropped from the top of a 10 m high building. If the initial speed of the ball is zero, then what its speed after 2 sec(assume constant acceleration of 10m/s2 towards the surface of the Earth for any object falling near its surface)

The correct option is A 20 m/s From the equation of motion, v = u + a t where, v = final velocity u = initial velocity (0 in this case) a = acceleration (here acceleration due to gravity 10 m/s2 ), t = time Velocity = 0 + 10 x 2 = 20 m/s

A ball is dropped from the top of a 10 m high building. If the initial speed of the ball is zero, then what its speed after 2 sec(assume constant acceleration of 10m/s² towards the surface of the Earth for any object falling near its surface)

The correct option is A
20 m/s

From the equation of motion,

v = u + a t

where,

v = final velocity

u = initial velocity (0 in this case)

a = acceleration (here acceleration due to gravity 10 m/ $s^{2}$ ), t = time

Velocity = 0 + 10 x 2

= 20 m/s