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Question

A ball is in a hot air balloon that starts from rest at t = 0 and accelerates upwards at 2m/s2. After 10s, the ball is dropped from the balloon.Draw ball's v - t graph:



Your Answer
A

Your Answer
B

Correct Answer
C

Your Answer
D


Solution

The correct option is C


From v - t graph velocity should increase linearly till t = 10s and then decrease linearly after t = 10s.

V at t = 20s

v = u + at

v = 0 + 2(10)

= 20 m/s

Ball then has an acceleration of -10 m/s2

Time when v = 0, will be

v = u + at  

0 = 10 + (-10)t

0 = 20 - 10t

20 = 10t

t = 2s

At t = 12s, velocity will be ______

Velocity will be negative after t = 12 s

Correct option is c.

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