Question

3. A body is thrown vertically upwards with a
velocity of 20ms and returns after some
time into the throwers hands, with the same
magnitude of velocity. The average velocity
during the whole journey will be
a) 20 ms
b) 40 ms
c) 60 ms
d) zero​

Answer 1

Answer:

option B

Explanation:

Correct option is B)

Given that,

Initial velocity u=20m/s

Final velocity v=0

Now, from equation of motion

v=u−gt

0=20−10t

t

1

=

10

20

t

1

=2s

Total time

t=2t

1

t=2×2

t=4s

Hence, the time is 4 s