Mechanics> ball-is-thrown-vertically-upwards...
If a ball is thrown vertically upwards with a velocity of 40m is, then velocity of the ball after two seconds will be (g = 10 m/s2)
(a) 15 m/s
(b) 20 m/s
(c) 25 m/s
(d) 28 m/s
2 Answers(b)
Initial velocity (u) = 40 m/s
Acceleration a = -g m/s2 = -10 m/s?
Time = 2 seconds
By 1st equation of motion,
v = u + at
v = 40 - 10 (2) = 20 m/s
v=u+at =>v=40+(-10)2 = 20m/s
option (b)
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