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Grade: 9
        
A piece of ball is thrown vertically upwards, it reaches a maximum height of 7 meters.
     (i) What was the initial speed of the ball?
(ii) How much time is taken by the ball to reach the highest point?    
 
2 years ago

Answers : (1)

Arun
22967 Points
							
Dear Aditya
 
S = h = 7 metres
 
V² = u² -2 *g*s
0 = u² - 20*7
u² = 140
u = 11.83 m/sec
 
Now for the time taken
V = u - gt
0 = 11.83 - 10 *t
t = 1.183 sec
 
Regards
Arun(askIITians forum expert)
2 years ago
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