6.
A child drops a ball from a height of 20m
Assume that is velocity increases uniformly at
rate of 10 m/s² ? Find 1.the velocity with which
the ball strikes ground 2.the time by the ball to
reach ground.
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The Ball will reach the ground at a speed of 20 m/s in 2 seconds.
Explanation:
Height (h) = 20 m
Acceleration (a) = 10 m/s²
Initial Velocity (u) = 0 m/s
Time will be taken as 't' and final velocity as 'v'.
h = ut + 0.5at²
= 20 = 0.5*10*t*t
= 20 = 5t²
= 4 = t²
= 2 s = t
As we have calculated the time required by the ball to reach the ground, now it's time for the final velocity.
v² = u²+2ah
= v² = 2ah
= v² = 2*10*20
= v² = 400
= v = 20 m/s
Hope this helps.
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