Question

A projectile is fired horizontally with speed of 98ms from top of hill 490m high find the horizontal distance from foot of hill

Answer 1

From equations of motion

Taking horizontal component,intial velocity in horizontal direction is 98 while in vertical its 0

⟹v=

u

2

+2gh

=

98

2

+2×9.8×490

⟹v=98

2

m/s

y=

2

1

gt

2

⟹t=

g

2h

=

9.8

2×490

⟹t=10s

solution