A ball is thrown from a roof top at an angle of 45 above the horizontal. iT hits the ground a few seconds later. aT what point d
uring its motion,does the ball have
A,greatest speed
B, smallest speed
C,greatest accelaration? Explain
A,greatest speed
B, smallest speed
C,greatest accelaration? Explain
1 answer:
You might be interested in
Answer:
F = -49.1 10³ N
Explanation:
Let's use the kinematics to find the acceleration the acceleration of the bullet that they tell us is constant
² = v₀² + 2 a x
Since the bullet is at rest, the final speed is zero
x = 11.00 cm (1 m / 100 cm) = 0.110 m
0 = v₀² + 2 a x
a = -v₀² / 2 x
a = -1320²/(2 0.110)
a = -7.92 10⁶ m / s²
With Newton's second law we find the force
F = m a
F = 6.20 10⁻³ (-7.92 10⁶)
F = -49.1 10³ N
The sign means that it is the force that the tree exerts to stop the bullet