Question

11. A body is moving vertically upwards. Its
velocity changes at a constant rate from 50 m s' to 20
ms- in 3 s. What is its acceleration ?
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Answer 1

let acceleration be (a),final velocity be(v), initial velocity be(u) and time be (t)
acceleration=final velocity (v)- initial velocity (u)/ time(t)
or,a=v-u/t
or,a=20-50ms-1/3s
or,a=-30ms-1/3s
or,a= -10m/s2