Question

A ball having initial velocity as = 20i +40j
calculate time of flight?
(1) 4 sec
(2) 8 sec
(3) 16 sec
(4) 5 sec​

Answer 1

Answer:

4 sec

Explanation:

initial velocity u = 40 – 20, because it is moving in different directions

T=?

u=20m/s

g=10 m/s²

time of flight T = 2u/g

T= 2×20/10

therefore,T=4 second

Answer 2

Answer:

8sec

Explanation:

• The initial velocity of the ball in y direction,u =40m/s
• g does not effect the horizontal component x,so we take the j component as the initial velocity.
• therefore time of flight T=2u/g

=2.40/10

=8sec