Modern Physics> from the top of a tower 40m high a ball i...

from the top of a tower 40m high a ball is projected upward with speed 20m/s at an angle of elevation of 30 degree . calculate the time taken by the ball to hit the ground

Pranjlee Srivastava , 9 Years ago

Grade 11

1 Answers

Vikas TU

Write the eqns. for y- direction,

-40 = 20sin30*t – 0.5gt^2

-40 = 10*t – 5t^2

t^2 – 2t – 8 = 0

t^2 -4t + 2t – 8 = 0

t(t-4) + 2(t-4) = 0

(t+2) (t-4) = 0

t = 4 seconds.

Last Activity: 9 Years ago

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Modern Physics> from the top of a tower 40m high a ball i...

from the top of a tower 40m high a ball is projected upward with speed 20m/s at an angle of elevation of 30 degree . calculate the time taken by the ball to hit the ground

Pranjlee Srivastava , 9 Years ago

Vikas TU

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