Answer to Question #25822 in Mechanics | Relativity for nthabiseng

Question

9. The SI units of is
a) kgm-1s-1 b) kgms-1 c) ML-1T-1 d) No unit e) None of them

A motorist travelling 60 km/h brakes to a stop in 100 m.
10. Her acceleration assuming it to be constant, is
a) 1.39 m/s2 b) - 1.39 m/s2 c) 9.81 m/s2
d) - 9.81 m/s2 e) None of them

11. If her acceleration was a = - 9.81 m/s2, her stopping distance would be
a) 5.5 m b) 10.5 m c) 14.2 m d) 20.3 m e) None of them

12. Her stopping time in question 10 is
a) 20 s b) 30 s c) 15 s d) 12 s e) None of them

13. Her stopping time in question 11 is
a) 20 s b) 30 s c) 15 s d) 12 s e) None of them

A ball is thrown vertically upward from the ground with a velocity of 1.8 x 106cm/min.
14. The time it will take to reach its highest point will be
a) 30.58 s b) 10.20 s c) 3.06 s d) 0.31 s e) None of them

15. The maximum height reached by the ball will be
a) 9.81 m b) 0.46 m c) 4587.20 m d) 45.90 m e) None of them


16. How long after being thrown will the velocity of the ball be 10 m/s upward?
a) 2.04 s b) 29.60 s c) 10.20 s d) 2.96 s e) None of them

17. How long after being thrown will the velocity of the ball be 10 m/s downward?
a) 2.04 s b) 31.62 s c) 10.20 s d) 6.12 s e) None of them

18. When will the displacement of the ball be zero?
a) 0 s & 30.58 s b) 3.06 s & 6.12 s c) 2.04 s & 3.06 s d) 0 s & 61.16 s
e) None of them

Answer 1

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