Question

A ball is thrawn straight upward with a speed v form a point h meter above the ground.The time taken for the ball to strike the ground is
a) v/g[1+√1t2hg/v2]
b) v/g[1-√1-2hg/v2]
c) v/g [1-√1+2hg/v2]
d) v/g [2+2hg/v2]​

Answer 1

Answer:

Explanation:

s=vt−

2

1

​

gt

2

Now, at C (maximum height point),

h

‘

=

2g

v

2

​

So, for journey from C to B,

time =

g

2(h+h

‘

)

​

​

=

g

2(h+

2g

v

2

​

)

​

​

=t

2

​

⇒ total time =t

1

​

+t

2

​

=

g

v

​

(1+

1+

v

2

2hg

​

​

)