A store is projected vertically upwards with a velocity of 20m/s. How high does it take before it comes to ground level? what is the time taken for the flight.?

VTPETERS2002

5 years ago

Use the equation,

v²=u²−2gh

Here, v=0m/s, u= 20m/s, g=10m/s²(approx)

Substituting these values we get,

H= 20 m. So the ball will go upto 20m height.

fransixgodwin

5 years ago

The height it gets to before reaching the ground is:
V²=u²-2gh
But at maximum height v =0
0=u²-2gh
U²=2gh
H=u²/2g
H=400/(2*10)
H=20m

Time of flight is =
V=u-gt
V=20-10t but v=0
10t=20
T=2sec