Question

a body moving with uniform acceleration describes 12m in the third second of it's motion and 20m in the fifth second find the velocity after 10th second​

Answer 1

Answer:

42m/s

Explanation:

S nth = u.n+ 1/2an² - u(n -1) - 1/2a(n-1)² =  u + a/2(  2n -1) = u+a(n-0.5)

S 5th =  u +- 4.5a = 20

S 3rd =  u+ 2.5a = 12

a = 4 mls²

u = 2 m/s

v = u + at

v = 2 + 40 = 42m/s