Answer:
a = (2v) / ( t^2)
Step-by-step explanation:
v = 1/2 at^2
Multiply by 2
2v = 2 * 1/2 at^2
2v = a t^2
Divide each side by t^2
2v / t^2 = a t^2 / t^2
2v / t^2 = a
25% of 80 is D. 20kg
50% of 80 is 40 and we know that 25% is half of 50%, so half of 40 would be 20.
So, the answer is D. 20kg
Hope this helps! :)