Assume both snowballs are thrown with the same initial speed 27.2 m/s. the first snowball is thrown at an angle of 75◦ above the horizontal. at what angle should you throw the second snowball to make it hit the same point as the first? the acceleration of gravity is 9.8 m/s 2 . answer in units of ◦ .

15 deg

Explanation:

Assume both snowballs are thrown with the same initial speed 27.2 m/s. The first snowball is thrown at an angle of 75◦ above the horizontal. At what angle should you throw the second snowball to make it hit the same point as the first? The acceleration of gravity is 9.8 m/s 2 . Answer in units of ◦ .

Given:

For first ball, θ1 = 75◦

initial velocity for both the balls, u = 27.2 m/s

for second ball, θ2 = ?

since distance covered by both the balls is same.

Therefore,..

R1=(u^{2} sin2\alpha _{1}) /g[/tex]

the range for the first ball

the range for the second ball

R2=(u^{2} sin2\alpha _{2}) /g[/tex]

(u^{2} sin2\alpha _{2}) /g[/tex]=(u^{2} sin2\alpha _{1}) /g[/tex]

sin2\alpha _{2})=sin2\alpha _{1})

=sin^-1(sin2\alpha _{1})

=1/2sin^-1(sin2\alpha _{1})

=

15 deg

when it gains or loses electrons

it is called kinetic energy