Question

Projectile's horizontal range on level ground is R=v20sin2θ/g. At what launch angle or angles will the projectile land at half of its maximum possible range. Enter your answers numerically separated by commas. Express your answer using two significant figures.

Answer 1

`\theta = 15^o \: or\: 75^o`

Step-by-step explanation:

As we know that the formula of range is given as

`R = (v^2sin2\theta)/(g)`

now we know that

maximum value of the range of the projectile is given as

`R_(max) = (v^2)/(g)`

now we need to find such angles for which the range is half the maximum value

so we will have

`(R)/(2) = (v^2)/(2g) = (v^2sin(2\theta))/(g)`

`sin(2\theta) = (1)/(2)`

`2\theta = 30 or 150`

`\theta = 15^o \: or\: 75^o`