Alan is trying to throw a ball across a 50m wide river 100m below him. alan knows physics so he throws the ball at a 45 degree upward angle at 30m/s for maximum distance. will the ball cross the river?

yes

Explanation:

u = 30 m/s

θ = 45°

h = - 100 m (below)

d = 50 m

g = - 9.8 m/s^2

Use second equation of motion in vertical direction

By solving we get

t = 7.17 s

The horizontal distance traveled in this time

= u Cos45 x t = 30 x 0.707 x 7.17 = 152.1 m

This distance is more than the width of the river, So the ball crosses the river.

(75°f − 32) × 5/9 = 23.889°c

increasing transnational kinetic energy. because the transnational kinetic energy formula consists of only two variables, mass and velocity, increasing one of those properties is the only way to increase an object's transnational kinetic energy. increases to mass and velocity, however, do not have the same impact.