Question

A body is moving vertically upwards. It's velocity changes at a constant speed of 50 m/s to 20/s in 3 sec.What is its acceleration

Answer 1

Given: Initial velocity,u= 50m/s ,  Final velocity, v=20m\s , Time, t= 3s

To find: Acceleration, a=?

Solution: 
              Using Newton's 1st equation of motion, v= u+at, we get, 
     
              
              20 = 50 + a(3)
              20-50 = 3a
             -30 = 3a
              a = -30/3
          ∴ a = -10m/S^2


:)