[Examination 3] Physics for Engineers

A ball is thrown vertically upward with an initial velocity of 3 m/s from a window of a tall building. The ball strikes the ground level 4 seconds later. Determine the height of the window above the ground.

• A. 66.331 m
• B. 66.450 m
• C. 67.239 m
• D. 67.492 m

A stone was dropped freely from a balloon at a height of 190 m above the ground. The balloon is moving upward at a speed of 30 m/s. Determine the velocity of the stone as it hits the ground.

• A. 69.03 m/s
• B. 68.03 m/s
• C. 67.30 m/s
• D. 69.23 m/s

A ball is thrown vertically at a speed of 20 m/s from a building 100 m above the ground. Find the velocity and position of the stone above the ground after 5 seconds.

• A. 4.67 m, 48.30 m/s
• B. 4.54 m, 47.68 m/s
• C. 5.43 m, 47.69 m/s
• D. 5.68 m, 48.20 m/s

A ball is thrown vertically at a speed of 30 m/s from the top of a tower 200 m high. Determine the velocity of the stone and the time that it strikes the ground.

• A. 11.50 sec, 65.80 m/s
• B. 11.45 sec, 66.59 m/s
• C. 10.30 sec, 67.21 m/s
• D. 10.14 sec, 69.45 m/s

A ball is thrown vertically with a velocity of 20 m/s from the top of a building 100 m high. Find the velocity of the stone at a height of 40 m above the ground.

• A. 39.71 m/s
• B. 40.23 m/s
• C. 39.88 m/s
• D. 39.68 m/s

A projectile is fired from the top of a cliff 92 m high with a velocity of 430 m/s directed 45° to the horizontal. Find the range on the horizontal plane through the base of the cliff.

• A. 18.959 km
• B. 23.408 km
• C. 15.273 km
• D. 20.365 km

A stone is thrown outward at an angle of 30° with the horizontal into a river from a cliff 120 meters above the water level at a velocity of 36 km/h. At what height above the water level will the stone start to fall?

• A. 121.27 m
• B. 189.29 m
• C. 111.38 m
• D. 152.22 m

A stone was thrown upward at an angle of 60° with the horizontal and a resultant vertical speed of 100.0 m/s. If gravity decelerates the speed at 9.8 m/s², what is the actual speed of the stone 10.0 seconds later?

• A. 57.77 m/s
• B. 64.22 m/s
• C. 60.35 m/s
• D. 67.23 m/s

A projectile is launched at 45° to the horizontal on level ground at a speed of 60 m/s. Neglecting air resistance, what is the range of the projectile?

• A. 366.86 m
• B. 355.29 m
• C. 663.24 m
• D. 386.66 m

A ball thrown at an angle of 30° with the horizontal from a point 60 m from the edge of a vertical cliff 48 m high just misses the edge. Determine the initial velocity of the ball and the distance beyond the cliff where it strikes the ground.

• A. 28.4 m/s; 32.6 m
• B. 26.1 m/s; 46.9 m
• C. 27.5 m/s; 56.5 m
• D. 31.1 m/s; 43.2 m