Answer:
The other angle is 75⁰
Explanation:
Given;
velocity of the projectile, v = 10 m/s
range of the projectile, R = 5.1 m
angle of projection, 15⁰
The range of a projectile is given as;
To find another angle of projection to give the same range;
<u>Check: </u>
sin(2θ) = sin(2 x 75) = sin(150) = 0.5
sin(2θ) = sin(2 x 15) = sin(30) = 0.5
Explanation:
According to the law of conservation of energy,
......... (1)
As we know that, P.E = mgh
and, K.E =
Therefore, putting these values of P.E and K.E into equation (1) as follows.
Now, initial case is that its starts with 50.3 m/s at bottom.
P.E = m and PE = 0
And, as it reaches the height h,
P.E = mgh
So, K.E will be m
Hence, speed = 6 m/s