1.

- A ball thrown vertically upwards returns 4 s later.(i) What is the initial velocity of throw?(ii) How much high it goes? [19.6 m s-1, 19.6 m]

Answer»

we know that, v= u+athere, v =0m/s a = - 9.8m/s square t= 2 s0= u+ (-9.8*2)or, 0= u-19. 6or, u= 19. 6the initial velocity of the ball is 19.6 m/s.

We also know, s= ut + 1/2 at. tso, s= 19. 6*2+1/2*(-9. 8)



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