Question

An object of mass 5 kg is thrown vertically upward with velocity 40 m/s. A) What is the velocity after 4 second? a) Zero b) 10 m/s c) 5 m/s d) None of these ​

Answer 1

Answer:

Distance travelled, s = 10 m

Final velocity, v = 0 m/s

g = -9.8 m/s

2

1) Using,

v

2

−u

2

=2gs

u

2

=196

u=14m/s, where u is the velocity with which the object is thrown upwards.

2) Using,

v=u+gt

t=

g

v−u

=1.43 sec

Explanation:

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Answer 2

Answer:

Explanation:

4sec = 5kg/40m/s = 1/8.

V = 4×0.125 = 0.5