Question

An object is projected vertically up with 20 m/s .its time of flightis

Answer 1

Answer:

bject is a point mass.

There is no variation of acceleration due to gravity (g is assumed to be constant=10m/s^2)

There is no air resistance.

Height of the thrower is neglected.

Now we can start answering .As the acceleration is constant(both in magnitude as well as direction) we can use equations of motion for uniform acceleration.

Defining our coordinate axis

As our motion is one dimensional choosing only one axis . Let upward direction is assumed positive.

Using equation , v=u +a*t { u=+20m/s , a=-10m/s^2, v=0 }

putting all the values

t=2 s

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