Question

They picked up sir Mohan's suitcase and flung it onto the platform.(rewrite using a participle)

Answer 1

They picked up sir Mohans suitcase and flung to the platform.

Hope it helps you.

Answer 2

They picked up sir Mohan's suitcase and flung it onto the platform.
Using participle: Picking up sir Mohan's suitcase, they flung it onto the platform.