4.5 m/s
5.2 m/s
3.7 m/s
3.9 m/s
You give a sled a push up a snowy 19o incline. It come to a stop 2.4 m up the slope. What was its initial speed? Assume no friction.?
2016-06-20 10:34 pm
回答 (1)
2016-06-20 10:47 pm
Take g = 9.81 m/s²
Loss in K.E. = Gain in P.E.
(1/2) m u² = m g h
u = √( 2 g h) = √[2 × 9.81 × (2.4 sin19°)] = 3.9 m/s
...... The answer is : 3.9 m/s
Loss in K.E. = Gain in P.E.
(1/2) m u² = m g h
u = √( 2 g h) = √[2 × 9.81 × (2.4 sin19°)] = 3.9 m/s
...... The answer is : 3.9 m/s
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