1.

An object is thrown upwards with speed of 50m/s.its height from the ground after 7 sec is

Answer»

Given,
SPEED of object thrown above , u = 50m/s
Time , t = 7sec
Let object reach h hight in 7 sec from the ground ,when we thrown it with speed 50m/s .

Use formula,
S = UT + 1/2at²
here , s = h , a = -g and t = 7sec
Now, h = 50 × 7 - 1/2 × 10 × (7)²
= 350m - 245M
= 105M

Hence, height is 150m



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