1. Tardigrade
  2. Question
  3. Physics
  4. From the top of a tower 20 m high, a ball is thrown horizontally. If the line joining the point of projection to the point where it hits the ground makes an angle of 45o with the horizontal, then the initial velocity of the ball is:

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. From the top of a tower 20 m high, a ball is thrown horizontally. If the line joining the point of projection to the point where it hits the ground makes an angle of $45^{o}$ with the horizontal, then the initial velocity of the ball is:

Motion in a Plane

Solution:

Since angle with the horizontal is $45^{\circ}$,
vertical height = range
$\Rightarrow 20 = u \times 2$ or $u = 10 \,ms^{-1}$
$\left(\because t=\sqrt{2h/g}=\sqrt{\frac{2\times20}{10}}=2 s\right)$