176. A body is thrown vertically upwards with a velocity of 980 cm/sec then the time the body will take to reach the ground will be

A.1 sec

B.2 sec

C.2.5 sec

D.4 sec

177. A body is thrown vertically upwards from the ground with a speed of 980 cm/sec. It will rise to a height of

A.980 cm

B.490 cm

C.49 cm

D.10 cm

178. A stone falls from the top of a building 200 m high and at the same time another is projected vertically upwards with a velocity of 50 m/sec, then the two will meet

A.After 1 sec

B.After 2 sec

C.After 4 sec

D.After 5 sec

179. A ball is dropped vertically downward from the top of a building and another one is thrown horizontally. Which will strike ground first

A.One dropped vertically

B.One thrown horizontally

C.Both will strike simultaneously

D.It will depend on their mass

180. A rubber ball is dropped from a height of 2 metres. To what height will it rise if there is no loss of velocity after rebounding

A.4 metres

B.3 metres

C.2 metres

D.1 metre

181. A 6 m long rope of weight 0.5 kg/m is hanging freely from a support. The work done in lifting up the rope upto the support point will be

A.6 kg-m

B.18 kg-m

C.9 kg-m

D.12 kg-m

182. A boatman rowing his boat at normal speed takes 12 minutes to cover 2 kilometers downstream, while rowing up stream at the same speed he takes 20 minutes to cover the same distance. The normal speed of the boat is

A.2 kilometres/hour

B.4 kilometres/hour

C.6 kilometres/hour

D.8 kilometres/hour

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