Question

The distance h a body will move in a free fall is expressed by the formula h = 1/2 gt 2. If g = 980 cm per sec per sec and t = 20 sec, the distance h is A. 368,000 cm. B. 49,000 cm. C. 196,000 cm. D. 9,800 cm.

Answer 1

The correct option is D. The distance h is 196000 cm.

Step-by-step explanation:

The given formula is,

`h=(1)/(2)gt^2`

Where, g is the gravitational acceleration,

t is the time in second,

Here, g = 980 cm per sec and t = 20 seconds,

Therefore,
`h = (1)/(2) * 980(20)^2=490* 400=196000`

Thus, the required height = 196000 cm

Therefore option D is correct.