Answer:
Hello There!!
Explanation:
You use the formula:K.E. = 1/2 m v2.
kinetic energy=1 / 2 × 10 × 5 ²(the power of 2 means you multiply the number by itself)
half of 10 is 5 so you do 5×5².
kinetic energy=5×5²=(5×5=25) so 25×5=125 Joules.
hope this helps,have a great day!!
~Pinky~
Answer: it’s A
Explanation: hope this is right!!!!
Solving for the acceleration of the bullet
acceleration = (vf^2 – vi^2) / 2d
acceleration = ((280 m/s)^2 – (420 m/s)^2) / (2 * 0.12 m)
acceleration = (78400 - 176400) / 0.24 m
acceleration = -98000 / 0.24
acceleration = -408333 m/s^2
Solving for contact time with board
t^2 = 2d/a
t^2 = 2 * 0.12 m / 408333 m/s^2
t^2 = 0.24 m / 408333 m/s^2
t^2 = 5.8775558 x 10^-7
t = 0.0007666 s or 767 microseconds
(I was only able to do A and B)