Question

A body is thrown down with velocity 10 metre per second its velocity after 10 second is???
A)90 m/s
B)100 m/s
C)110 m/s
D)200 m/s
E)250 m/s

Answer 1

Answer:

given ,

u = 10 m/s

a = g = 10 m/s^2

t = 10 sec

we know,

v = u+at

v = 10+10(10)

v = 110 m/s

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Answer 2

Answer:

$90m/s$ is the velocity of the body after $10seconds.$

Explanation:

Let the velocity with which body is thrown $u = 10m/s$

Let the velocity with which body returns $= v m/s$

Time taken by the body to attain a velocity $v m/s = 10seconds$

When a body is thrown from upwards it acceleration

$= gm/s^{2} = 10m/s^{2}$  in downward direction

$a = -g = -10m/s^{2}$

Using Ist equation of kinematics,

$v = u +at$

$v = 10 -10(10)\\v =10-100\\v=-90m/s$

Therefore ,$90m/s$ is the velocity of the body after $10seconds$ in downward direction.

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