Question

A body thrown vertically upwards from the ground comes back to the ground in 4 sec.What is the maxheight attained by the body?

Answer 1

Answer:20m

Explanation:

2u/g=4

U=20m/s

And u^2/2g is Max height

20x20/2x10

=20m

Answer 2

Answer:

20m

Explanation:

Hey Mate

Here's your answer

We Have a formula

T=√(2u/g )

here

u=speed of body

g=10m/s²

4=2u/10

40=2u

u=√20m/s

u=2√5 m/s

Now for maximum Height

s=ut+1/2 at²

Here a=-g. because body is thrown against gravity

T=2sec

S=2√5 * 2 -1/2 * 10 * 2²

=4√5-5*4

=4(√5-5)