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

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 , 8 Years ago
Grade 11
anser 1 Answers
Vikas TU

Last Activity: 8 Years ago

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.

Provide a better Answer & Earn Cool Goodies

Enter text here...
star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Ask a Doubt

Get your questions answered by the expert for free

Enter text here...