Part (a): Brady must achieve a minimum speed of
to make the jump across the river.
Part (b): Brady’s leap speed is feasible since it is below the world record speed.
Further details:
(a)
Brady attempts to jump a horizontal span of
from a height of
, obeying Newtonian motion laws.
Given:
Horizontal distance: 
Vertical height: 
Concept:
The horizontal measurement in meters is
.
The vertical measurement in meters is
.
The time of flight is calculated using the equation of motion:

Replacing
with
and rearranging to solve for
:

Substitute values:
for
and
for
in the equation.

The flight time equals the duration to cover the horizontal distance.
Brady’s horizontal velocity is:

Therefore, Brady’s minimum speed must be
to cross successfully.
(b)
The minimum speed Brady must run at is
.
The world record speed is:
Thus, Brady’s required speed is achievable because it remains below the world record.