Question

a stone is thrown from the top of a building upward at an angle of 30 degrees to the horizontal and with an initial speed of 20 metre per second if the height of the building is 45 metre how long is it before the stone hits the ground​

Answer 1

ANSWER

Given Range =80 m

In vertical direction :

s=ut+

2

1

at

2

⇒−80=0+

2

1

×(−10)t

2

⇒t=4 sec

In horizontal direction :

υ=

t

range

=

4

80

m/s=20 m/s