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hi

A stone is thrown off a cliff at 60 km/hr with an angle of inclination of 70°. If the cliff has a 400m drop, what vertical velocity will the stone have when it hits the ground and how long will this take? (Take g = -9.8) 

 Nov 7, 2015
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Vertcal velocity.  Use v^2 = u^2 + 2*a*s  where v = final vertical velocity, u = initial vertical velocity = (60000/3600)*sin(70°)  m/s ≈ 15.66 m/s,  a = -g = -9.8 m/s^2, s = 400m

 

v^2 = 15.66^2 - 2*9.8*400    (m/s)^2    so v  =  ...     you can finish this off

 

For the time use  v = u + a*t  where t is the time.

 Nov 7, 2015

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