A body of mass 2kg is projected from the...

A body of mass 2kg is projected from the ground with a velocity `20ms^(-1)` at an angle `30^@` with the vertical. If `t_1` is the time in seconds at which the body is projected and `t_2` is the time in seconds at which it reaches the ground, the change in momentum in `kgms^(-1)` during the time `(t_2- t_1)` is

`40sqrt3`

`50 sqrt3`

`60`

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