Answer:

Explanation:
The range of a projectile is given by the formula

where in this case, we have
d = 100 m is the range
u is the initial speed (the magnitude of the initial velocity)
g = 9.8 m/s^2 is the acceleration of gravity
is the angle of projection
Solving for u, we find:

Now we can easily find the components of the initial velocity:

So, the initial velocity of the ball is

where i and j are the unit vector indicating the horizontal and vertical direction.
You are given the half life of an isoptope which is 5.2yr and the numer of days that it will decay which is 30 months. You are required to find the initial mass of the isotope.
An = A0*exptaveln2/t1/2
30 = A0 exp^(30/12 * ln2/5.2yr)
A0 = 21.5grams
Answer:
14.826 kg
Explanation:
move the decimal at the end over to the left 3 times