Aball is thrown straight up with a velocity of 50 m/s.(use g = -10 m/s^2) a) what is the velocity in m/s after 2 seconds?
b) what is the velocity in m/s after 10 seconds?

(a) 30 m/sec

(b) -50 m/sec

Explanation:

We have given initial velocity of ball u = 50 m/sec

Acceleration due to gravity

(a) Time t = 2 sec

Now according to first equation of v = u-gt

So v=50-10×2=30 m/sec

(b) Time t = 10 sec

Now according to first equation of motion

So final velocity v = u-gt = 50-10×10 =-50 m/sec

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